BTR Brian Tooley Racing Heavy Duty LS Timing Chain | Fits GM LS and Gen V LT Engines | Direct Replacement for GM 12646386 & 12586482 | Enhanced Reliability & Performance

The Brian Tooley Racing (BTR) Heavy Duty Timing Chain is built to outperform and outlast standard GM chains, offering a precision-fit upgrade for LS and LT engine platforms. Designed as a direct replacement for GM part numbers 12646386 and 12586482, this chain features high-strength, heat-treated steel construction with superior fatigue resistance and minimal stretch. Perfect for performance applications running aftermarket cams, higher valve spring pressures, or forced induction, the BTR timing chain ensures precise valve timing, consistent performance, and long-term durability. Whether you’re refreshing a stock motor or building a high-horsepower setup, this chain is a must-have for reliable engine operation under extreme conditions.

• Direct OEM Replacement: Designed to replace GM 12646386 and 12586482 timing chains in LS and LT engines with no modifications required—fits like factory but built for performance.
• Heavy Duty Steel Construction: Manufactured from premium, heat-treated steel to withstand high loads and resist stretching under aggressive camshaft and valvetrain conditions.
• Precision Timing Stability: Delivers consistent and accurate camshaft timing, reducing the risk of timing drift or mechanical failure in high-RPM and high-compression engines.
• Ideal for Performance Applications: Perfect for engines with upgraded camshafts, boost, or nitrous setups that demand extra strength and tighter control over valve events.
• Trusted BTR Quality: Backed by Brian Tooley Racing’s reputation for proven valvetrain reliability and precision-engineered performance components trusted by LS and LT builders worldwide.