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.

Key Features:

• Designed for use with Small Block Chevy engines
• Fits setups using 7/16-inch rocker arm studs
• Accurately replicates rocker arm geometry for precise pushrod measurement
• Reusable design for repeated use in multiple builds
• Helps prevent premature wear caused by incorrect pushrod length
• Durable construction for long service life

Specifications:

• Tool Type: Pushrod Length Checker
• Compatibility: Small Block Chevy with 7/16" rocker studs
• Material: Hardened steel (or comparable high-strength alloy)
• Use Case: Engine assembly, valvetrain geometry setup, cam swaps, cylinder head swaps

Applications:
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.