No more fumbling with a magnetic base and a dial indicator to measure cam lift. Fixture bolts to deck surface of block, maintains location and holds the dial indicator with 5" extension at the precise angle over the lifters, assuming proper geometry. Supplied with 1/2" and 7/16" adapters for use with any engine block. Designed to work with cylinder head NOT installed on block. Includes 0 - 1. 000" Dial Indicator!Pit Stop USA offers Proform Cam Checking Fixture 66830 at low everyday prices. Be sure to check out all of our products from ProForm including ProForm Cam Checking Tools.