Product Description
Michigan Motorsports LS1 Rocker Arms w/ Upgraded Trunnion Bearings Installed
Fits 1999-2013 4.8L 5.3L 5.7L Cathedral Port LS Engines and 1999-2006 6.0L Engines.
Upgrade your LS valvetrain with Michigan Motorsports’ LS1 rocker arms, professionally assembled with premium trunnion bearings for unmatched durability and performance. Designed to replace the failure-prone stock needle bearings, this complete set is ideal for both stock rebuilds and high-performance heads-and-cam builds. Each rocker arm comes ready to install with the trunnion upgrade already in place, ensuring reduced friction, improved reliability, and peace of mind for your LS engine.
Fitment
- LS1, LS2, LS6, LR4, LM7, L59, LQ4, LQ9, LM4, L33, LS4, LY2, L20, LY5, LMG, LMF, LH6, LC9, LH8, LH9
- Also fits LS1/LS2/LS6/LR4 Vortec 5300 LM7 L59 LM4 L33 engines
- Compatible with 4.8L, 5.3L, 5.7L, and 6.0L LS-based engines (only 1999-2006 on 6.0L engines)
- Will not fit: Rectangle port "LS3" style cylinder heads
Kit Includes
- (16) LS Series rocker arms with roller bearing trunnion upgrade installed
- (16) High-strength Allen head bolts for rocker arm installation
Why Upgrade?
- Prevents common failures: Replaces OEM cageless needle bearings that can fail and scatter metal debris through the engine.
- Premium materials: 8620 steel alloy trunnion with caged roller bearings for improved longevity.
- Performance-ready: A must-have for aggressive camshaft and cylinder head upgrades.
- Ready to install: Rockers arrive fully assembled with the trunnion kit installed—no extra work required.
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Product Reviews
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ls rebuild parts and services
great quality
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Thank You
As they they should be.
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Ls1 rocker arms
Good quality and easy to install instructions are very clear. It is clear that these rocker arms are of good quality and meant to last
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liltlebmw@aol.com
liltlebmw@aol.com
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Flawless
Nice upgrade to top off our DOD delete 5.3 great quality and design. Way better than stock. Very happy with these on our comp cam with Diablo tune 5.3. Not going to wear out like the factory design did.
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Great product
Awesome rockers with simple instructions. Just bolt right in torque and your done.
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LS Rockers W/upgrade
Great product you guys, simple install and by just looking at the new trunion style it gives me confidence there will be no more failures such as the needle roller caged style has! I'm in the bottom end now, LIFTERS!!!
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Excellent
Great product, well built, reasonable price and got it very quick. I love it
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Rocker/trunnion upgrade
Very good quality pieces!
