Product Description
Michigan Motorsports LS1 Rocker Arms w/ Upgraded Trunnion Bearings Installed
Fits 4.8L, 5.3L, 5.7L, and 6.0L GM LS Engines – LS1, LS2, LS6, LQ4, LQ9, LY5, LM7, L33, and More
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
- 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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LS1 Rockers
Michigan Motorsports was wonderful to work with!
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Great Replacement
These rockers are a much better replacement than stock. I installed these on my 05 5.3 Silverado with ease.
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LS1 rockers w/upgraded trunions & bolts
Great value for the money. Nice looking parts.
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LS1 Rocker Arm Upgraded
Great parts and service would definitely recommend
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LS1 rockers with upgraded trunions
Perfect replacement with lash area cleaned up
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Working great
Well built
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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
