The Proform 66790 is a precision tool designed to help engine builders accurately determine the correct pushrod length when assembling or modifying a Small Block Chevy engine with 7/16-inch rocker arm studs. Correct pushrod length ensures proper valvetrain geometry, which is critical to engine performance, reliability, and longevity.
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Ideal for engine builders, machine shops, or DIY enthusiasts building or modifying Small Block Chevy engines. The Proform 66790 is a must-have tool for ensuring accurate pushrod fitment, especially when upgrading cams, lifters, or cylinder heads.
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