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SDPC Raceshop CHE High Performance LS & LT Rocker Trunnion Kit

New

CHE4290

CHE Precision has helped develop with our own Raceshop engine builder Kurt Urban one of the most advanced high performance trunnion replacement kits on the market today for LS1, LS2, LS3, LS6, LS7, LS9, the GEN5 LT1 and LT4 stock rockers.

The factory production LS rocker arm is a lightweight proven design, but as valve spring pressures and valve lift increased it became necessary to find ways to improve upon the stock LS rocker's reliability. By replacing the stock caged roller bearing assembly with CHE’s precision machined trunnion and proprietary bushing material, this unique design maintains the low-mass rotating weight of the stock LS rocker design while providing superior reliability for high RPM LS race engines. If you are looking for a professionally engineered and track tested LS trunnion rocker arm replacement, CHE and the SDPC Raceshop have the solution.

USD219.99219.991219.99

551

Sours: https://sdparts.com/i-24101310-sdpc-raceshop-che-high-performance-ls-lt-rocker-trunnion-kit.html

Current Issue

Text and photos by the author.

Highly regarded as “today’s” hot smallblock Chevy, GM’s family of LS engines represents a real milestone in performance V8 engine design. Even straight out of the factory, the LS (in all of its variants) produces decent power. The oiling and sealing systems represent drastic improvements over the early smallblock design, and they make great platforms for additional aftermarket power enhancements. It’s relatively easy to make these buggers scream, thanks in large part to the advanced cylinder head designs that were started by GM and further HP-injected via a wide selection of aftermarket heads. The performance aftermarket has a solid grip on the LS platform (and continues to develop go-fast components for the LS), making it easy to pump additional ponies and torque without gnashing your teeth or bruising your brain.

Overall, the factory LS engines offer surprisingly decent durability. However, in the process of building/modifying any performance LS engine, if you plan to use OE rocker arms (whether re-using originals or using new OE rockers), you should be aware of the critical need to perform an upgrade to the rocker arms. Specifically, the OE trunnions and trunnion bearings should be replaced with an aftermarket upgrade kit.

There’s really nothing wrong with GM’s original rocker arm design. The rocker arms are lightweight and stiff, and strong enough to withstand most high-performance street applications.

The bad news is that in high rpm situations and when used in conjunction with high valve spring pressures, the factory cageless trunnion needle bearings’s outer shell may tend to begin walking out of the rocker arm’s pivot trunnion bore, resulting in individual needle bearings quickly falling out and scattering throughout the engine (the OE needles are captured by two separate housings, and the outer housing tends to walk out, releasing the needles). Obviously, this isn’t good for either the rockers (no bearings) or the rest of the engine. And let’s face it — any performance-minded customers will stomp the throttle and lean on their engines from time to time, and it’s also very common for owners to pump up the volume by making a performance cam change (which in most cases will involve higher-than-factory valve spring pressures).

Note that the recommendation to upgrade LS rocker arm trunnions is not limited to performance enthusiasts alone. Any LS engine that will be exposed to abusive conditions will benefit from this upgrade. This can include LS engine applications for police vehicles and other emergency vehicles, as well as commercially used trucks that will experience heavy engine loads.

If, during an oil change, you find small “mystery” needle bearings in the oil or stuck to the magnetic drain plug, this is clear evidence of rocker arm needle bearing failure (the needles have left the rockers and are now wiggling around on top of the heads and washing down through oil drain back holes on their way to the sump. And along the way, who knows what little orifices they’ll migrate into (a scary thought). As I mentioned earlier, this condition, although possible in any daily driver, is more prone to occur if the engine is operated at frequently high engine speed, and/or if high valve spring pressures are used (as when changing over to a hotter cam that includes higher-rate springs). This warning bears repeating. The inexpensive OE rocker arm bearing setup is a proven weak link in the LS system.

[PAGEBREAK]

Knowing that this possibility exists, the best course of action is to address the issue before it becomes a problem, either by changing to high quality aftermarket performance full-roller rockers (any reputable aftermarket rocker manufacturer will use high quality caged bearings in their rockers), or by upgrading the original rocker arms. Especially for those on a limited budget, upgrading the OE rockers is an excellent option.

Comp Cams, as an example, offers a very high quality trunnion bearing upgrade kit, part number 13702-KIT. This kit, applicable to LS1/LS2/LS3/LS6/LS7 OE rockers, includes new trunnions, new caged and prelubed bearing assemblies, circlips and rocker arm mounting socket head cap screws (along with two thick installation-assist washers). The new trunnions feature extended tips with circlip grooves. Instead of the bearing housings relying on a press fit, the additional circlips serve to prevent possible bearing assembly walk-out. These bearings aren’t going anywhere, so the rocker bearing issue is no longer a concern. The new trunnions and bearings are also made of higher quality materials and are designed to withstand higher RPM and high spring pressures.

Comp’s upgrade kit replaces the (cheap) cageless OEM needle bearing assemblies and powdered metal trunnions with very high-strength premium 8620 steel alloy trunnions and fully-caged roller bearings for vastly-improved durability. According to Comp Cams, this rocker arm upgrade has been tested and performance-proven for several years in the NASCAR GM LS spec engine series.

If your customer intends to “play” with his/her LS engine and they plan to use OE rockers, upgrading the trunnions is a MUST-DO modification to avoid potentially catastrophic engine damage.

NOTE: While you can change-out the trunnions and bearings using a hydraulic press, a specialty tool designed for use with a common bench vise was recently introduced by Summit Racing. Their new rocker arm vise tool, P/N SME-906011, makes this job a breeze, and is ideal for removing the OE bearings and installing Comp Cams’ trunnion upgrade kit. This is the tool that I used during the upgrade pictured in this article.

By the way, if you need a set of new GM rocker bodies, Summit also offers an eight-pack of new, shot-peened GM rocker bodies (without bearings, so there’s no need to press out the old ones). These rockers (eight-pack) are available under Summit’s P/N SME-143000. The vise tool was developed by Summit’s Trick Flow division, and works like a charm.

TRUNNION UPGRADE PROCEDURE

Performing this retrofit upgrade is relatively simple, requiring no modifications to the rocker arm. While you can perform the job with a punch, a press or vise, an appropriate-size socket and snap ring pliers, Summit Racing has recently introduced a very cool specialty tool that allows you to get the job done using only their kit, a bench vise and snap ring pliers.

In this article’s example, we took advantage of the new Summit rocker arm vise tool, which includes all tools needed to remove the OE bearings and install the upgrades.

By the way, this is a good time to clean the rocker arm bodies. If you want the rockers to look factory-fresh, clean with solvent, or have them professionally tumble-cleaned with a fine-grit stone, or you can glass bead blast the disassembled bare rocker bodies. If you do decide to blast with fine glass bead, be careful not to concentrate and dwell any blasting in the trunnion bores or on the valve tips or pushrod cups. Do not run any type of hone or reamer in the trunnion bores. If trunnion bores appear to be damaged (burred, scored or pitted), replace the rocker arm. You must avoid altering the trunnion bore dimensions.

[PAGEBREAK]

1. Place the Summit tool vise fixture onto one jaw of your bench vise. Place the OE rocker into the fixture’s V-saddle.

2. Align the (black) Summit presser to the OE bearing, with the counter bored end of the presser facing the bearing. Tighten the bench vise to press-out both OE bearings and the trunnion (needles will fall out). Inspect/clean rockers as needed.

3. Place the (black) presser onto the short end of the kit’s mandrel. Slide a new bearing onto the long end of the mandrel (make sure that the stamped symbols on the bearing faces the mandrel’s flange).

4. Slip the aluminum alignment sleeve onto the long end of the mandrel, seated against the bearing.

5. Slide the mandrel assembly into the rocker arm bearing bore (the aluminum alignment sleeve enters the bore first to align to the rocker body).

6. Using the bench vise, press the bearing into the rocker body until the mandrel’s flange bottoms out onto the rocker body. Perform this single-bearing installation to all 16 rockers before proceeding with trunnion and opposite-side bearing installation.

7. Place the rocker arm body onto the Summit vise fixture, with the previously-installed bearing facing the fixture.

8. Slide the new trunnion halfway into the bearing bore (leaving the outside end of the trunnion exposed to align the remaining bearing). Apply engine oil to the outside of the bearing. Slip the remaining bearing onto the exposed trunnion (make sure that the stamped symbols on the bearing cage face outward).

9. Place the kit’s thick steel washer onto the end of the trunnion (against the bearing face).

10. Tighten the bench vise until the washer bottoms out against the rocker body.

11. Verify that the trunnion rotates freely, and that a slight amount of endplay (side-to-side) exists, in the range of 0.004 - 0.008 inch. If you don’t have any endplay, adjust bearing depth accordingly.

12. Using snap ring pliers, install one circlip to each end of the trunnion. Verify that the clip is fully seated in the trunnion clip groove.

13. Install the upgraded rocker arms to the cylinder heads using the new socket head cap screws supplied in the Comp Cams kit.

Be sure to rotate the trunnion so that the flat recess side of the trunnion’s bolt hole faces upward (the socket head cap screw must seat against this recessed flat side of the hole). Tighten the cap screw to a value of 22 ft.-lbs., following the OE installation procedure.

[PAGEBREAK]

NOTE: Install the new upgrade kit using either a press or with Summit’s new rocker arm vise tool. It’s critical to smoothly draw the OE bearings out and draw the new bearings in. Do not try to bang the old trunnions out or attempt to install the new bearings with a hammer. Leave your hammer in the toolbox. 

MANUFACTURER LISTING

COMP CAMS

3406 Democrat Rd.

Memphis, TN 38118

(800) 999-0853

www.compcams.com

 

SUMMIT RACING

(800) 230-3030

www.summitracing.com

 

Available trunnion/bearing upgrade items

Item /  Manufacturer / PART NO.
Rocker arm trunnion upgrade / Comp Cams / 13702-kit
Rocker arm vise tool / Summit Racing / SME-906011
New shot-peened GM rocker  bodies (w/o brgs) / Summit Racing / SME-143000 (eight-pack)

 

Sours: https://www.autoserviceprofessional.com/articles/2494-upgrading-ls-rocker-arm-trunnions-a-necessary-fix-for-an-ls-weak-link
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Comp Cams trunnion upgrade

The Comp Cams trunnion (bottom) is an alloy steel unit that places the full load of the rocker arm on a 360-degree surface area. Compare that to the factory, powdered metal trunnion (top) that places the rocker arm load on half as much surface area. The bearings in the Comp kit are also fully captured, with the trunnion and bearings held in place by a heavy duty snap ring.

*photography by: the author

Ironing out Weaknesses in the LS-Series Rocker Arm

While the excellent design and capability of the LS-series V-8 has been well proven after a decade and a half of production, it still has a few small weaknesses that can lead to trouble in a performance application. One of those is the rocker arm trunnions.

First, a little design history. The valvetrain in the LS series (and next generation LT series) is a net-lash design. This means that the valvetrain is not adjustable from the factory, and each rocker arm is secured to the head by a bolt that when tightened properly, sets the lash/lifter preload to factory spec. This was done to cut down on engine assembly time and costs.

Unlike the Gen I and Gen II small-blocks, which used a 1.5 ratio stamped-steel rocker arm and pivot ball from the factory (except LT4 engines which came equipped with factory roller rockers), the LS series uses a 1.7 ratio diecast, ductile iron rocker arm body with a needle bearing equipped, powdered metal trunnion to reduce friction and wear.

Comp Cams trunnion upgrade

Comp Cams trunnion upgrade kit, part number 13702-KIT, comes complete with everything needed to upgrade all 16 rocker arms. The kit has seen widespread use in NASCAR, NHRA, IHRA, and other forms of racing where the stock rocker arm body must be used.

The Achilles heel of this design is in the needle bearing package and trunnion. The needles are uncaptured inside the bearing retainer. Where the failure occurs is when the rocker arm trunnion begins to press the bearing pack out of place inside the rocker arm body, eventually leading to the needle bearings being ejected into the oil and sucked through the oiling system. This can lead to engine damage and possible failure.

To solve this problem, Comp Cams designed a trunnion upgrade kit, part number 13702-KIT, that eliminates this potential problem. The kit utilizes a much stronger alloy steel trunnion in place of the factory powdered metal unit, along with fully captured needle bearing sets held in place in the rocker arm body by snap rings. The new trunnion also allows for 360-degree travel of the rocker arm, spreading the load on the trunnion bearings across a much greater surface area, which reduces wear on the bearings and trunnion.

The kit typically retails for a little over $100 and is available direct from Comp or through most retail performance outlets like Summit Racing and Jegs. That’s a small price to pay when compared to the repairs that are typically needed when a rocker arm fails on a running engine.

On the left is a rocker arm with the Comp Cams trunnion upgrade kit installed, on the right a bone stock factory rocker arm.

On the left is a rocker arm with the Comp Cams trunnion upgrade kit installed, on the right a bone stock factory rocker arm.

 

The factory trunnion setup uses a stamped cap to keep the trunnion and bearings in place. In high performance, high rev applications, the movement of the rocker arm along with normal operational vibrations and energies transmitted through the valvetrain can cause the trunnion to move laterally inside the rocker arm body (or the rocker arm body to move laterally on the trunnion) and eventually press the retaining cap out of the body, which then releases the needle bearings into the engine and oil.

The factory trunnion setup uses a stamped cap to keep the trunnion and bearings in place. In high performance, high-rev applications, the movement of the rocker arm along with normal operational vibrations and energies transmitted through the valvetrain can cause the trunnion to move laterally inside the rocker arm body (or the rocker arm body to move laterally on the trunnion) and eventually press the retaining cap out of the body, which then releases the needle bearings into the engine and oil.

 

This rocker arm came out of an LS3. After a few track days the engine suddenly developed a miss, and the owner feared a piston or other major internal component had failed. What had really happened was the rocker began moving from side to side on the trunnion and wasn’t opening and closing the valve properly. Fortunately the owner shut the engine down before the trunnion had come fully loose and ejected the needle bearings into the oil.

This rocker arm came out of an LS3. After a few track days the engine suddenly developed a miss, and the owner feared a piston or other major internal component had failed. What had really happened was the rocker began moving from side to side on the trunnion and wasn’t opening and closing the valve properly. Fortunately the owner shut the engine down before the trunnion had come fully loose and ejected the needle bearings into the oil.

 

When the retaining caps come loose from the rocker arm, this is what gets ejected into the oiling system. Sometimes the screen on the oil pickup will catch the needles and keep them from being sucked through the full oiling system, but not always.

When the retaining caps come loose from the rocker arm, this is what gets ejected into the oiling system. Sometimes the screen on the oil pickup will catch the needles and keep them from being sucked through the full oiling system, but not always.

 

The Comp Cams trunnion (bottom) is an alloy steel unit that places the full load of the rocker arm on a 360-degree surface area. Compare that to the factory, powdered metal trunnion (top) that places the rocker arm load on half as much surface area. The bearings in the Comp kit are also fully captured, with the trunnion and bearings held in place by a heavy duty snap ring.

The Comp Cams trunnion (bottom) is an alloy steel unit that places the full load of the rocker arm on a 360-degree surface area. Compare that to the factory, powdered metal trunnion (top) that places the rocker arm load on half as much surface area. The bearings in the Comp kit are also fully captured, with the trunnion and bearings held in place by a heavy duty snap ring.

 

LS Rocker ARM Trunnion Upgrade 07

Changing the trunnion in an LS rocker arm is easy. The factory trunnion can be tapped or pressed out, and Comp has a special tool to aid in the removal of the old trunnion that also helps when installing the new bearings and trunnion.

 

With the Comp Kit, the trunnion cannot move inside the rocker arm body thanks to the snap ring retention system. Not only does this eliminate the chance of the trunnion pressing the bearings out of the rocker arm body, it also maintains proper rocker arm alignment on the valve stem, which can cause a whole other set of potential problems. The Comp trunnion kit also reuses the factory net-lash rocker arm retention system, so reinstallation of the rockers is a breeze.

With the Comp 13702-Kit, the trunnion cannot move inside the rocker arm body thanks to the snap ring retention system. Not only does this eliminate the chance of the trunnion pressing the bearings out of the rocker arm body, it also maintains proper rocker arm alignment on the valve stem, which can cause a whole other set of potential problems. The Comp trunnion kit also reuses the factory net-lash rocker arm retention system, so reinstallation of the rockers is a breeze.

Patrick Hill has grown up around the automotive aftermarket, and carries a lifelong passion for performance, racing and automotive nostalgia that spans from the Tri-Five era to the current modern performance market.

Sours: https://gm-efi.com/tech/why-upgrade-the-trunnions-on-your-ls-rocker-arms/
LS Engine Tech: Straub Rocker Trunnion Upgrade
Valvetrain - Rocker Arms / Trunion Upgrade

Looking for an LS part and don't see it on the site? Need a rotating assembly, short block kit, or machine work? Our LS team here at Butler is shipping high performance GM/LS engines, kits, and parts all over the world.


Call us at 931-829-2200 today for any LS need.

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