The LSA /ZL1 Supercharger Heavy Duty Race Drive design is specifically for the LSA/ZL1 supercharged engines used in extreme applications. The unique Race Drive pulley positions are optimized to provide extreme belt wrap to avoid slippage under heavy loads during racing and extreme usage.
On engines not running high mount A/C or running Low Mount A/C
you will need to use a GM tensioner part number 12628025 (this is the standard LSA 6 rib tensioner for the Alternator and power steering which bolts to the two main bolt bosses on the left side of the LSA/ZL1 water pump) with a smaller 6 rib pulley to clear the race drive
Provides maximum belt wrap that won't slip at sustained high engine speeds.
Supports virtually any know upper and lower overdrive pulley used individually or in combination. It allows up to a 10 inch lower crank pulley and any overdrive upper pulley (stock 3", 2.85", 2.55", 2.38", etc...)
Rigid belt tension with unique tension setter.
Supports both standard deck and tall deck applications including blocks with manifold spacers.