PRW Now Carries a Heavy Duty Main Cap Stud Kit for GM LS Series Engines!
We’re excited to announce our new Main Cap Stud Kit for your LS Engine. Available for 4.8, 5.3, 5.7, and 6.0L LS Based Engines from 1997-2015 with a 6 Bolt Main.
If you want to improve the life of your engine block, upgrade your stock bolts to stronger, more capable studs.
If you’re upgrading with higher horsepower parts, the higher cylinder pressures may cause the stock bolts to stretch which is knows as main cap “walk”. This can create high vibration causing damage to contacted surfaces. What can happen is the loosening of other parts such as main bearings and eventually oil pressure loss.
Our main cap upgrade replaces the stock bolts to high performance studs. PRW uses premium grade Custom 4150 Steel rated at “aircraft” quality. Our studs are then specially heat-treated to 180,000 psi. This heat treating procedure allows for total heat penetration which results in a stronger, more superior stud compared to lesser quality studs from other manufacturers.
Find purchase and pricing here: PRW Online Store – LS Main Cap Stud Kit
Take a look at our 6061 Billet Aluminum Pulley Girdle Kit fitted with our PRW Higher Performance Aluminum Water Pump and Pulley! Fits Chevy GM LS Gen III/IV Series Edelbrock, Stewart, and PRW Water Pumps with GM 8-Bolt Hub PRW now has the answer to strengthen your LS Water Pump Pulley for Supercharged LS Engines! Our Pulley Girdle Kit will bolt on to aftermarket 8-bolt hubs to brace your pulley for supercharged applications. Made of 6061 Billet Aluminum and will include 4 fasteners and thread locker.
PRW 0816412 Chevy Corvair Roller Tip Rocker Arms: 1959-69 Flat Six 1.6 x 3/8″
Chevy Corvair Enthusiasts Unite! We are glad to announce that we now offer Sportsman Roller Rocker Arms for your beloved Corvair Flat Six Engine. Made of 4340 Chromoly Steel Rocker Bodies which are much stronger than your ordinary stamped steel. Roller Tips will minimize scrubbing and we’ve added our oiling hole in a special location necessary for the Flat Six. For more information take a look here: PRW 0816412
- Rated at 350lbs open spring pressure
- Set of 12 (includes 3/8″ pivot balls and RockerLocs)
- Heat Treated Pivot Balls
- 4340 Steel Rocker Bodies
PRW is proud to introduce our Project Car for our 2021 Catalog!
Amidst the numerous disruptions caused by COVID-19 this year, PRW has worked hard to maintain our status in the automotive aftermarket parts industry and we’re proud to have upheld our operations along with progressively growing throughout all aspects. We’ve put in the extra effort to provide our parts and additionally introduce new parts to our product line.
We’d like to introduce another project of ours, set to make a debut on our upcoming 2021 PRW Catalog. We’ll be working alongside many outstanding companies for this build and will document our progress here. This blog post will be updated showing steps of our build, which parts and companies we’re working with, and so on. This will be a great time for all and we’re excited for the journey and final result.
Take a look at our choice of Radiator for our 2021 Catalog Car Build!
has an awesome Direct Fit Downflow Radiator Module which will suit our needs and yours too!
Need stopping power? Our 2021 Catalog Car needs that also! Of course we went with the BEST:
Our 2021 Catalog Car is going under the knife Awesome work is being done by
JEP Autoworks is a full service automotive repair and performance shop located in the Hemet / San Jacinto Valley. Starting out in 1999 as a general automotive repair facility, JEP has expanded into the business of building, tuning and modifying vehicles establishing our reputation as one of the top names in the performance automotive industry. From off-road vehicles, to full race, to performance street machines and exotics or for just reliable, quality repair services on stock vehicles, JEP Autoworks puts our reputation and quality in every vehicle we work on.
Our 10,000 square foot facility in Hemet, CA features a full showroom showcasing our work and offering a variety of performance speed, stereo and electronic parts & accessories. JEP Autoworks is equipped with a Dynocom 1800X series Chassis Dynometer for vehicle tuning and dyno services. Our 8000 square foot repair bay includes 5 chassis lifts, a 4-post vehicle lift, tire mounting and balancing, welding and metal fabrication equipment. Separate from JEP Autoworks main building is our 3000 square foot paint and body center. The JEP Autoworks showroom and service facility is open Monday – Friday 5 days a week and is available after hours by appointment to accommodate client schedules.
AT JEP our occupation is our passion. We are gear-heads who love what we do and take pride in both our reputation and customer loyalty. All jobs at JEP are seen through to ensure our customer expectations are met and we will always stand behind our work. As both active participants and attendees of automotive events, organizations, races and trade shows in the auto electronics and performance automotive industry we stay up on the latest industry trends & technology to ensure our clients receive the best advice and recommendations we can offer.
For hours, contact and location information please see our contact page. For questions about our work, quotes, project planning or for a tour of our facility contact JEP Autoworks during normal business hours.
Looking into the best suspension setup? Our 2021 Catalog Car was in need of one too! We obviously went with Global West Suspension. We chose the Negative Roll Coilover Front End Kit. Part # COMNR-6466V. Negative Roll is used for a street /road handling application, which was perfect for our build! We have more Global West parts for the rear also so stay tuned!
For More info please check out Global West Suspension
Take a look at those carbs. Our 2021 Catalog Car is coming along quite nicely thanks to
Silver Sport Transmissions, an Elite Distributor of TREMEC® Transmissions, is the industry leader in the research and development of kits to modernize the drivetrain of classic cars, trucks and street rods. Their SST A41 Automatic, TREMEC TKO and T5 5-Speeds, and TREMEC Magnum 6-Speed PerfectFit and RestroFit® Kits are the best fitting and most complete kits available.
After seeing how comprehensive their kits are and the attention to detail, it was a no-brainer to choose their Tremec TKO Kit with the TKO 600 Ratios.
- Tremec TKO 5 Speed Overdrive
- 500-600 torque capacity wide or close ratio.
- No tunnel cutting
- Compact billet aluminum shifter mechanism provides smooth shifting with short throws. True internal offset with perfect factory shifter positioning.
- Exclusive SST case customization – CNC machined for a PerfectFit™ without compromise to the transmission
- Thoroughly tested for leaks and performance.
- Market Leading Warranty – learn more
- Optional Carbon Fiber Lined Synchronizer blocker ring upgrade for higher rpm shift capability
- Lower Cost Option Classic Fit option available for non-console installations. Cutting is required; it will not provide factory shifter positioning.
- CAD designed, lightweight, easy bolt-in
- Driveshaft & Slip Yoke
- Lightweight, steel, custom driveshaft for superior strength. Dynamically balanced for smooth operation and premium solid u-joints come standard.
- Speedometer Connection
- Mechanical and electronic compatible
- Calibrated Speedo Cable or Electronic Speedo Connector – Your choice
- Reverse Light Connector
- Pilot Bearing
- Super heavy-duty needle roller type with lube seal for long life
- Isolator Mount
- Rubber for vibration isolation
- Installation Hardware
- Detailed Installation Instructions – including free lifetime tech support
- Market Leading Warranty – learn more
This is just the beginning! More parts and info on our Transmission Parts from Silver Sport Transmission will be updated soon!
For more information on Silver Sport Transmissions, please check their website: https://shiftsst.com/
Kilmat Car Sound Deadening Mat is currently being installed with their 80 mil thickness mat.
PRW Visits Jep Autoworks to Test and Tune our 1966 Ford Mustang 2021 Catalog Car
We took a field trip to JEP Autoworks in Hemet, CA to take a look at the progress of our 1966 Ford Mustang 2021 Catalog Car. The vehicle is near completion and we’re pleased with the wonderful results from JEP Autoworks and the Outstanding companies who helped build this Mustang from the ground up with their products.
Here’s a highlight video of the day showcasing some of the parts used and some dyno clips. We’ll be posting dyno runs and output information soon so stay tuned!
Much thanks to our Friends and Sponsors for the build:
Global West Suspension
Wilwood Disc Brakes
Canton Racing Products
Silver Sport Transmissions
Be Cool Inc
Powermaster Peformance Starters and Alternators
Inland Empire Driveline
Pacific Performance Products
JBA Performance Exhaust
Steering is an essential part of a build which doesn’t get enough attention at times. We’ve looked into what would fit best with our build and our choice was with Unisteer. They carry great steering systems and components for classic and custom vehicles. We’ve decided to pick part number 8001110-01-01 that can be seen here.
We liked how the kit was versatile enough to fit different builds, as stated on their website:
“The kit will work on Big Block and Small Block cars, and have been successfully used with Stock Manifolds, and Hooker Super Comp Headers. Other Headers may work, but we can’t guarantee an easy install. This kit requires the use of a mini starter. This kit may require some modifications on Mustangs with Dart Heads and other Aftermarket Heads requiring different headers.”
Installation was a breeze and we had no problems with clearance or any other issues. We’re starting to test drive our Mustang and hopefully testing it on a track soon. We’ll be updating our testing soon!
For more information with Unisteer, please visit their website: https://www.unisteer.com/
Stay Tuned…More to come!
Follow us on Social Media:
COVID-19 and our commitment to you
Hours of Operation (shipping included): Monday – Friday 7:00am-4:00pm
To Our Valued Dealers, Distributors, Resellers and Consumers,
In response to the virus, we’ve implemented updated best practices in our workplace to help ensure the health and safety of our employees and customers. PRW Industries is also closely monitoring the COVID-19 situation and working tirelessly to serve the needs of our customers and individuals who are quickly adapting to new ways of life as we all pull together to curtail this outbreak.
Putting our Employees and Customers First
In accordance with California’s recent statewide stay-at-home order, some employees in our Los Angeles area headquarters are now working from home. We have temporarily limited on-site business operations to essential staff in our office and warehouse to ensure fulfilment and delivery of customer orders with minimal interruption. These essential employees adhere to recommended hygiene and social distancing practices, and janitorial services have been enhanced to preserve a clean, healthy work environment.
These precautions are designed to ensure customer orders are picked, packed and shipped by healthy employees. Once a package leaves our warehouse, it’s entrusted to one of our shipping partners. A large percentage of these orders are delivered via UPS or the US Postal Service, both of which are taking steps to ensure the health of their employees and safe parcel delivery. UPS has published its COVID-19 response and the USPS is following guidelines published by the CDC. PRW and its overland fulfilment partners are pulling together to deliver the highest, healthiest level of service to our customers.
Technical Support & Customer Service
PRW will continue to provide Customer Service and Technical Support via telephone on a limited basis. It may become necessary to return telephone calls at specific times of day to fulfill the needs of our customers and consumers. If the Customer Service and/or Tech Team is working from home, we have made arrangements for telephone transfers to respond to incoming calls. Please be patient, since inventory feeds may not be readily at-hand under those circumstances. Dealers, distributors, retailers, and resellers may wish to subscribe to our daily inventory feed. That service that is available in digital format at 4:00am PDT/PST every morning to better monitor product availability and keep your customers informed accordingly.
Commitment to Fair Prices
PRW is committed to fair pricing. Tariffs and other supply chain fluctuations, industry adjustments, and changes in consumer demand will no doubt place pressure on warehouse distribution and the e-commerce system as a whole. The management and staff at PRW Industries are especially grateful to you – our loyal customers – for helping to ensure best business practices, especially during trying times like these.
As the COVID-19 situation remains fluid, PRW Industries is committed to helping customers manage through these difficult times. Our company will continue to monitor and respond to federal, state and local health authorities to protect our employees and serve our customers safely, and with minimal disruption.
President, PRW Industries
As the world adjusts to the impact of the coronavirus (COVID-19), our shipping times/delivery has slightly changed depending on which shipping provider is used. Details are listed below and can be updated at any time.
Fedex: Temporarily suspending signature required for most deliveries in the U.S.
- Except for shipments with adult signature required, physical signature not required for:
- FedEx Express (U.S. and Canada)
- FedEx Ground (U.S. and Canada)
- FedEx Freight (U.S.)
- FedEx Office in-store (U.S.)
- FedEx SameDay City (U.S.)
- FedEx Onsite Retail Locations (U.S.)
UPS: UPS is maintaining delivery services except where limited by government restrictions. We are working in partnership with governments around the world to obtain exceptions that allow our operations to continue wherever possible, even in restricted areas. UPS delivery operations have been designated critical infrastructure by governments and we continue to pick up and deliver, even in restricted areas.
USPS: Despite the global health challenges we are facing, USPS remains committed to serving you. The safety of our customers and employees remains our top priority as we provide the essential service of delivering your mail every day. Get the latest updates on any service disruptions that may impact you.
USPS has temporarily suspended the guarantee on Priority Mail Express International® service destined for China & Hong Kong. Several countries have also issued updates on delivery delays or other service impacts.
Residential & Business Mail
Residential and business customers should check the latest shipping and delivery updates in your area. Also, be sure to double-check items that you may not mail such as flammable hand sanitizer and wipes.
Freight Carriers: LTL
- LTL carriers continue to operate within impacted areas and are considered “essential” providers of service.
- Our operations teams are monitoring pickups scheduled and messaging shippers in impacted areas (CA, NY, and PA currently) to confirm that they are available for pickup.
- Should any customers need shipments rerouted or held, as a result of business closures, our Ops teams are available to assist with that routing and to confirm what/if charges would be associated on a case by case basis.
Solving Ford 6.0L V8 Diesel Head Gasket Failures
The Ford 6.0 L diesel V8 engine was introduced in the mid-2003 production year, and ended in 2007 for most applications where it was offered. It has been an engine with a reputation for problems through its relatively short production life, although as the engine received upgrades, and proper repairs, it became more reliable. One major problem has centered on cylinder head gasket failures.
One of the major culprits here was the factory TTY (Torque to Yield) head bolts. The TTY bolts are considered to be ‘one-time use’ products, and if they are removed from the engine for any reason, they must be replaced with new fasteners. This is true in any application where TTY bolts are used.
The gasket failures could be caused by re-use of TTY fasteners, but also can be caused by failure of the oil cooler, an Exhaust Gas Recirculation (EGR) cooler failure, as well as performance add-ons… all of which will lead to increased cylinder pressures. These cause the TTY fasteners to fail prematurely, since the bolts are stretched beyond their yield specs, and the head gasket will soon fail.
The installation procedure for replacing the OEM TTY head bolts can be relatively simple, to complex.
The question becomes: Are you replacing the TTY bolts as a preventative maintenance procedure, or is this a repair caused by one of the three factors mentioned above. Regardless of the situation, because the early examples of the engine is prone to the failure of the oil cooler and/or EGR cooler, it is advisable to consider these as Achilles heels for the engine. Even a preventative maintenance head bolt replacement, should probably include replacement of those two components to avoid a failure in the future.
And, if you are considering a performance upgrade, replacement of the TTY head bolts becomes a “must do” item.
While the most straightforward approach to the gasket/bolt failure is to get a new OEM gasket and TTY bolts, the solution itself is more complex.
If the underlying cause of the failure is one (or both) of the above mentioned coolers, they must be replaced before addressing the head gasket situation. In the case of adding performance enhancements, they must be replaced with new, better than stock parts and find a stronger, more reliable fastener and gasket solution. Both components in early engines were particularly vulnerable to design failure, and there are several aftermarket replacements which overcome the problems.
Given the track record of head gasket failure on the 6.0L Ford diesel engine, the smart money would be to eliminate all of the weaknesses – head bolts, the gaskets, the oil cooler and EGR cooler. Servicing both areas requires removal of the valley cover for the oil cooler/filter assembly, and the intake manifold for the ERG cooler. Many experts suggest removal of the truck cab to make the job easier, but there are head bolt replacement videos which outline how to do the job with the cab in place.
If you are going to replace the head bolts or the bolts and gaskets, you will need to pull the heads off the block after draining all of the engine’s coolant and oil.
After the head is off, both the head and block surfaces need to be cleaned. After that is complete, each head bolt hole in the block needs to have the a thread chaser run down into each hole to the bottom to remove any debris, then blown clean with a blast of high pressure compressed air. Before installing (or reinstalling) the head gasket, the cylinder bores and piston tops should be wiped cleaned using a clean, no-lint cloth and an engine cleaning solvent. Using a steel straight-edge, check that the matching machined surfaces of the block and the head are perfectly flat. Any warpage must be re-machined, to true the surfaces, or purchase remanufactured heads from a reputable supplier.
Before reassembling the heads to the block, you need to source high-quality head studs and fasteners to assure a trouble-free installation. One company, Performance Quotient®, a division of PRW Industries®, offers a solution which focuses on the use of exceptional quality head studs, washers and nuts to clamp the head to the cylinder block.
The core of the Performance Quotient solution is the use of heat-treated, high-strength Custom 4135 Grade 12.9 Alloy Steel Cylinder Head Studs. Each PQx® #101420 Ford 6.0L Diesel Head Stud Kit contains the required 20 – M14-2.0 x 33.85mm (9/16″-18 x 1.33″) studs, having a shank outside diameter of 13.44mm (0.53”) and an overall length of 8.8125″, 20 – Custom 4135 Grade 12.9 Alloy Steel parallel ground washers and 20 – 12-point 9/16”-18 Custom 4135 Grade 12.9 Alloy nuts. Additionally, the kit provides the installer with a 2 ml bullet of medium strength (blue) PRW Threadlocker and 0.5 oz. packet of PRW’s CMD Extreme Pressure Assembly Lube.
These studs are centerless ground to assure uniform diameters, and feature rolled threads for greater strength and thread conformity to the block holes (as compared to cut threads). All studs, washers and nuts feature black oxide protective coatings.
The studs should be installed using the installer’s preference of threadlocker or engine oil. The studs should be installed in the block finger tight initially, and if desired, snugged into place using the proper Torx driver, using the holes in the end of the stud.
It is advisable to use a new OEM replacement head gasket set (or a performance grade gasket if increasing power, or doing heavy towing). The intake and valve cover gaskets must be replaced as well, and again, use OEM or better gaskets for best results. While the factory may not specify that the turbocharger be serviced at this time, it has already removed, and probably should be cleaned, serviced and the seals and gaskets replaced before reinstallation.
PRW assembly lube should be used to install the washers and nuts, coating both sides of the washers and the threads. Following the recommended tightening sequence, PRW recommends a four-step torqueing process – two rounds at 90 ft-lbs, loosening the nuts after each round, then retorque. Then loosen the nuts and retorque to 130 ft-lbs, and finally loosen all nuts and retorque to 180 ft-lbs. to complete the installation. This procedure is identical both for a new, replacement gasket, or re-installing the old head gasket.
The installation of new head studs on the 2003-07 Ford 6.0 L Diesel V8 diesel engine is indeed a long process when compared to a similar installation on a gasoline engine. However, the piece of mind and operational longevity makes the investment of time, labor and material well worth it.
Full Article can be found here: https://www.dieselarmy.com/features/pri-coverage/pri-2019-high-performance-diesel-shaft-rocker-kits-from-prw/
By BOBBY KIMBROUGH | DECEMBER 18, 2019
PRW Industries teased the industry a few weeks ago with a simple statement on their website: New Diesel Rocker Arms Coming Soon. As we passed their booth at this year’s PRI show, we spotted their new product line of diesel rockers.
Everyone can agree that diesel engines work as hard as any combustion engine, and they do it in the most hostile environments. Diesel means power. Products designed for diesel engines have to be able to withstand the awesome amount of power, and the heavy-duty applications these engines exist within.
Valvetrain has historically been a weak point for many diesel engines. PRW engineers have worked to help stabilize the valvetrain in these workhorse engines. PRW’s Bill McGloghlon showed us the company’s latest products.
First in line is the Dodge Cummins high-performance shaft rocker system (part #3235911). Designed for the 1987-1998 12-valve 4 and 6 B series turbocharged engines. These shaft rockers come complete with silicon-bronze bushings and McGloghlon assures us “they are a perfect upgrade to allow more power and efficiency from the engine.”
They come with everything you need, from ball adjusters and fasteners to the silicon bronze bushings.
The next new product in the PRW line is a similar item, except for the 1998-2018 24-valve 5.9 and 6.7 engines (part #3240811). “Each rocker is made from alloy steel substantially thicker than stock,” said McGloghlon. “Our shaft system is made as a ‘drop-in’ assembly using the stock ratio.”
For more information on these or other products from PRW, visit them online at prw-usa.com.
Shaft Rocker arm systems…
Stabilizing the Ford FE upper valve train
For over 20 years, the Ford FE-series engines were a key component in Ford’s engine family. The FE engine family was Ford’s initial “big blocks” and a key Ford weapon to the automaker “Horsepower wars” of the 1960s and early 1970s.
Appearing in the late 1950s, the initial offering was a modest 332 cubic inch engine, which supplemented the standard Y-block engines. It shared the Y-block design, where the block extended below the crankshaft, but had a significant number of improvements. The 332 was used in Ford and Edsel cars, but was quickly enlarged in 1958 to 352 cubic inches for police car use, and named the “Interceptor.” By the 1960 model year, the 352 Interceptor had become the base engine for Ford sedans, the Thunderbird and for Edsels.
By 1961, the horsepower race between the “Big 3” automakers had begun, and the 390 appeared as a high performance option with a performance grind cam, solid lifters, 10.5:1 compression and a cast “header”-style exhaust manifold – good for 375 horsepower. Interestingly, Ford included a 3×2 aluminum intake in the trunk, which could be installed by the dealer, good for over 25 more horsepower. This became the Ford big block option for several years in the Ford and Mercury lines – with various compression ratios and 2- or 4-barrel carburetors.
The 406 cubic inch version came in 1962 and was phased out for the iconic 427 by 1964. The 406 introduced the cross-bolt main caps, which was retained in the 427-inch engines. The 427 was developed as a true high performance engine – highly successful in NASCAR and drag racing, although the 406 could easily be considered as a high performance engine, since it powered a number of drag racing and circle track cars in lightweight Ford Galaxies. The factory Ford “Thunderbolt” team showcased the powerful 427 side oiler engines in ultra-lightweight mid-size Fairlanes, and the engine “made its bones” both in Galaxies in NASCAR, as well as the Fairlanes and Galaxies on the drag strip. They also powered Cobras and the Ford GTs in road racing – with 427 powered Ford GT Mark IIs sweeping the top three spots at LeMans in 1966.
The 428 came in 1966, with a more production-friendly design, and it found its mark both as a street performance engine, as well as a race package, with the popular Cobra Jet (CJ) and Super Cobra Jet (SCJ) offering some serious power with a variety of cam, carburetor and compression ratio options.
The FE-series powerplants, particularly the 390 cubic inch and larger versions, provided street performance enthusiasts, as well as racers, a very strong bottom end, and heads which were well known for having extremely good air flow characteristics. These factors, along with the factory’s medium- and high-riser intakes (for the 427) has kept the Ford big block performance popular long after they were supplanted by the 429 to 460 inch engines in the 1969 model year.
That popularity has been supported by plenty of FE-specific products from the factory and performance aftermarket. These products, which benefit from high tech, computer driven design and manufacturing techniques, continue to drive the FE engine marketplace, delivering more power and reliability.
Keeping the FE mystique alive
Even 40 years after Ford stopped production, the FE engines continue to perform very well on the drag strips, plus the growing interest in the nostalgia race cars – particularly in drag racing – has kept the FE-powered reproduction and restored race cars popular. Street performance cars, particularly the 428 CJ- and SCJ-powered Mustangs, and to a lesser extent, the Ford Torino, Mercury Cyclone and Cougar, have added to the FE popularity.
The upper valve train area has been particularly active for the FE-series powerplants, as improvements in technologies, materials and manufacturing processes have continued to improve performance.
One of the leading companies in the upper valve train field is PRW Industries of Perris, Calif. The company has recently made advances in its PQX shaft rocker arm systems for the FE engine family, reflecting improvements in both designs and manufacturing. These have delivered increases in performance, consistency and valve train stability.
Shaft-style rocker arm assemblies have grown in popularity over the years for street performance enthusiasts and racers (where class rules will allow them). The biggest advantage of the shaft system over the OEM-style pedestal mount rocker arm is rock-solid stability. As cam lifts and durations increase, along with higher spring pressures, the rigidity and consistency of the shaft system can deliver higher engine speed potentials, better air flow and more power. Even in a modest street performance application, the shaft system provides not only the potential of more power (depending on the cam profile, spring rates and the air flow characteristics of the head, intake and exhaust system), but improved durability. And, the shaft systems provide better valve train stability and durability compared to pedestal-mount rocker arms with billet aluminum girdles.
Like all PRW products, the PQX shaft rocker system design begins with a CAD (computer aided design) program, which is matched with premium quality materials to assure repeatable, precision manufacturing. In PRW’s manufacturing facilities, the CAD design is applied in the computer-aided manufacturing (CAM) centers to assure design tolerances are held to high standards, with repeated quality checks for all components throughout the manufacturing and assembly process. Immediately upon arrival in the PRW shipping department, the parts are again quality checked against the design tolerances.
The Ford FE-series shaft style rocker arm assembly
PRW’s PQX Ford FE-series shaft style rocker arm assemblies cover from the 352 cu. in. engine introduced in 1958 through 428 CJ and SCJ engines last made in 1978.
The assemblies are available two rocker arm styles — extruded aluminum made from SAE 2024 alloy (p/n 3339032) or the newest style –cast stainless steel alloy rockers (p/n 3239022), made from premium grade SAE 17-4ph alloy. Both have a 1.75 ratios, and are very strong and highly durable.
Materials aside, there are many similarities between the PQX aluminum and cast stainless rocker assemblies.
Both assemblies are compatible with low-, medium-rise intakes or high-port factory heads, as well as many performance aftermarket heads, which makes these rocker arm assemblies excellent for high performance street applications, and for racing (again, where sanctioning body rules allow shaft rocker arm assemblies). Both feature silicone-bronze bushing inserts for smooth, low friction operation, and use ball-style valve lash adjusters.
The roller tips are made from long-lasting Cr40 steel, which can withstand high rpms, high open spring pressures and the stress of high lift, long duration cam grinds. Both rocker arm are profiled on the underside to provide additional clearance for high performance valve springs.
Both kits use the same centerless-ground chromoly steel shafts that are bored for internal oiling of the rockers. Both systems feature CNC-machined double pedestal anodized billet aluminum end supports, billet aluminum intermediate support mounts and spacers, which ensures the entire structure is well-supported and rigid – critical to keep the valve timing geometry correct. The shaft supports are attached to the heads with PRW’s AXS® aerospace-grade rolled thread studs and 12-point nuts.
Both kits also include shims to fine-tune the installation to the head and pushrods and two pushrod length checking tools. Pushrods are not included in the kits, but PRW offers a wide range of its PowerPlus™ pushrods to assure the correct length for the application. Additionally, PRW has partnered with Manton® Pushrods to market their highly regarded pushrods, which offer an extremely wide selection of pushrod types and tips for mild to ultra-high performance applications.
In addition to the shaft rockers and pushrods for the FE-series engines, PRW markets CMD Assembly Lubricant, as well as PRW’s Vibra-Tite™ threadlockers to ensure the proper assembly and longevity of the entire system.
PRW is focused upon providing the racer or street enthusiast best quality valve train product – including the needed support products – for a long-lasting, high performance end result, all at an affordable price.
The arrival of the all-new General Motors LS-series engine in the late-1990s brought with it a new learning curve for the automotive enthusiast, as well as to the automotive engine service industry.
Identical only in a few areas, including the cylinder bore spacing, to the iconic small block Chevrolet that had dominated the North American automotive landscape for nearly a half century, the LS-series platform brought new directions to the company’s power plant offerings.
The engines were built to tighter tolerances and utilized many new features designed to generate greater efficiencies – delivering greater power from less displacement. A portion of this came from the all new head design that discarded the original valve layout of the small block Chevy (middle exhaust valves next to each other) and the continuation of the reverse cooling pattern introduced on the small block LT-1 in 1992 (where cool coolant is introduced at the top of the engine); both of which improved performance efficiency.
Additionally, General Motors made changes to the valve train, including the rocker arm design. The OEM rockers went from the familiar stamped steel design to a cast steel material, which was smaller and lighter. This allowed for higher engine speeds, while reducing the moving mass in the valve train.
While these were improvements in efficiency, there are a shortcomings. The trunion assembly, around which the rocker arms pivot, became subject to failure – even in everyday usage. The trunions were made from powdered metal, and the needle bearings were “uncaptured” – meaning there was no cage to keep the bearings in place. Additionally, the rocker arms pivot across a limited arc and the uncaptured bearings which were under the greatest stress were unable to rotate to distribute the wear like a caged needle bearing assembly. Eventually, the strain would begin to push the bearing pack out of position. This would lead the bearings falling out of the rocker arm assembly, and fall into the oil on the top of the head, which would lead to bearings getting into the engine’s oiling system – sometimes with catastrophic results.
The OEM rockers on the LS-1 and LS-3 heads, while lightweight, are not exceptionally stiff, and aren’t designed for sustained high RPMs, or higher performance cams and stronger valve springs.
Overcoming shortfalls in OEM design
As the LS-series engines have aged, the OEM rockers’ weak trunion design has become a problem, as the uncaptured needle bearings escaped from the rocker arms, and got into the oil galleys. Additionally, the OEM design’s inability to allow the needle bearings to rotate around the pivot of the trunion will cause the needle bearings to wear unevenly – potentially leading to failure.
PRW Industries has developed a solution to this problem with the development of replacement trunion assemblies (p/n 1213462). They feature a new design trunion made from a high quality alloy steel, which delivers high strength and long life. The new design also features fully caged (secured) needle bearings, which are held in place by C-clips, preventing the needle bearings from pushing out of the trunion assembly. The caged bearings in the trunion allow the rocker to have a full 360° rotation, allowing the bearings to rotate around the trunion’s pivot shaft, spreading the wear more evenly.
However, the replacement trunions take time to install – a problem for a service shop which desires to reduce the time to complete needed repairs.
Again, PRW has responded with a solution. Recognizing the need for timely service turn arounds, and enthusiast convenience, the solution has been to marry its trunion repair kits with new, improved replacement rocker arms which are much stronger than the stock arms.
The new PRW PQX LS Alloy Rocker Arms feature a tough, cast steel alloy material which makes them ideal as an OEM replacement, as well as ideal for a mild street performance application. The combination of the new stronger trunions, coupled with the light weight, but stronger, stock 1.7 ratio rocker arms deliver a much longer service life. They answer the needs of automotive service centers for rocker arms which install in normal time, are affordable and have longevity for the customer.
For the performance enthusiast who wants a reasonably priced, durable rocker arm which can accept valve springs with slightly higher pressures, plus a mild street performance cam, these rockers are an ideal solution.
The PRW PQX rocker arms are available for LS1/LS2/LS6, 5.7L-6.0L engines (1997 – up) with Cathedral ports (p/n 0634617), and LS3/L92 6.0L-6.2L engines (2007 – up) with offset intake, Square Port heads (p/n 0636417). Both part numbers include 8mm, Grade 12.9 Hex Socket Fasteners in the kit.
Affordable, durable and easy to install, the PRW PQX LS Alloy Steel Drop-In Rocker Arms provide a trouble-free solution to a problem for automotive service centers and the LS enthusiast community.