The Accu-Drive® camshaft gear drive kit replaces a 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 Accu-Drive® gears and slip in the idler assembly. The Accu-Drive® gear drive system transmits power from the crankshaft gear to a full floating main idler which drives the camshaft gear. The 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. NOTE: Image shows EDE#7890 and is for reference only. Actual product shipped will vary. Important Note: Accu-Drive® Gear Drives are not recommended for use above 7, 000 rpm or on computer-controlled vehicles with knock sensors.Pit Stop USA offers Edelbrock Accu-Drive Gear Drive - 351-Windsor (1962-85) 7892 at low everyday prices. Be sure to check out all of our products from Edelbrock including Edelbrock Gear Drives.