Edelbrock 7891 Accu-Drive gear drive.
Designed for Chevy 396 402, 427, 454 big block engines.
Replaces the stock timing chain with a precision gear drive system.
The gear drive can be easily installed.
Just replace the stock crank and camshaft sprockets with the Accu-Drive gears and slip in the idler assembly.
A unique feature of the edelbrock Accu-Drive system is the ability of the main idler gear to float to an optimum position between the crankshaft and camshaft gears, assuring absolutely equal load sharing between the crankshaft and the camshaft gears.
The gears are made form billet SAE-1144 steel with induction hardened teeth.
Gear teeth are shaved for precision operation.
The set features hardened and ground idler pins from billet steel.
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