Product Description
BTR Brian Tooley Racing LS1 Bare Rocker Arm – No Bearings
1.7 Ratio Drop-In Rocker for Cathedral Port Heads | Exhaust Side on LS3 Rectangle Port Heads
The BTR Brian Tooley Racing LS1 Bare Rocker Arm is a high-strength, drop-in 1.7 ratio rocker designed for cathedral port LS engines and exhaust-side use on LS3 rectangle port heads. Manufactured as an all-new bare rocker arm without bearings, this design focuses on maximum strength, valvetrain stability, and high-RPM reliability. FEA analysis shows these rockers are 46% stronger than factory Chevrolet rocker arms, making them ideal for performance builds where durability and consistent valve motion are critical. The extended tip design supports higher valve lift while improving valve tip durability, and the superior moment of inertia compared to roller-tip rockers helps maintain stability at elevated RPM levels.
Key Features
- 1.7 Ratio Drop-In Design: All-new LS1-style rocker arm engineered as a direct replacement for cathedral port heads, delivering reliable geometry without requiring modifications.
- 46% Stronger Than Stock: Proven through FEA analysis to offer significantly higher strength than factory Chevrolet rocker arms for increased durability under aggressive camshaft profiles.
- Extended Tip Geometry: Allows for higher valve lift capability while improving valve tip contact and long-term wear characteristics in high-performance valvetrains.
- High-RPM Stability: Superior moment of inertia compared to roller-tip rocker arms helps maintain valve control and stability at elevated engine speeds.
- Bare Rocker Configuration: Supplied without bearings; note that some bronze bushing trunnion kits may require honing for proper fit, and CHE trunnion kits are not compatible.
Key Fitments
- Cathedral Port LS Engines: Fits 1997–2013 4.8L, 5.3L, 5.7L engines and 1999–2006 6.0L LS-based engines equipped with cathedral port cylinder heads.
- Rectangle Port Exhaust Side: Fits exhaust side only on 2007-later 6.0L and 6.2L LS3-style rectangle port heads.
- Engine Codes: Compatible with LS1, LS2, LS6, LQ4, LQ9, LM7, L33, LH6, LR4, and LMG applications requiring LS1-style rocker arms.
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BTR bare rockers
This is a fantastic product! Michigan Motorsports for the win!
