Edelbrock 7891 Accu-Drive Gear Drive Kit Big-Block Chevy

The Edelbrock 7891 Accu-Drive camshaft gear drive kit replaces the stock timing chain in big-block Chevy engines with a precision gear drive system that eliminates chain stretch and provides accurate timing control. This compound gear drive train transmits power from the crankshaft gear to a full-floating main idler, which then drives the camshaft gear for smooth, precise valve timing.

Key Features:

• Full-floating main idler gear automatically positions itself between crankshaft and camshaft gears for equal load distribution
• Gears machined from billet SAE-1144 steel with induction-hardened teeth for maximum durability
• Precision-shaved gear teeth ensure smooth, quiet operation
• Hardened and ground idler pins machined from billet steel
• Multiple cam timing adjustment positions for optimized performance tuning
• Compatible with all standard camshafts
• Direct replacement for stock timing chain—no chain stretch or timing drift

Installation:

Installation is straightforward—simply replace the stock crankshaft and camshaft sprockets with the Accu-Drive gears and slip in the idler assembly. Most applications require no engine block modifications, though some fitting of the idler axles and front cover may be necessary depending on your specific engine configuration.

The Edelbrock Accu-Drive system delivers the precision timing control needed for high-performance big-block Chevy builds, ensuring consistent valve events and reliable operation at all RPM ranges.