Crankshaft Drive Nut for Big Block Chevrolet V8 engines
This ingenious product from Precision Performance is an essential accessory for every big block Chevy V8 engine. (small block version shown)
Precision Performance’s unique 2 piece assembly enables manual crankshaft rotation in Both Directions with a 1-1/16″ wrench or socket. This feature makes setting valve lash, static ignition timing, degreeing in camshafts, and any operation requiring a manual rotation of the engine simpler, safer, easier and more accurate.
An integral ultra rigid clamping surface positively secures harmonic dampers, blower drive hubs, and crankshaft accessory drive extensions. Precision Performance Products manufactures the 2-in-1 Crankshaft Nut Assembly utilizing high strength alloy, and includes a grade 8 twelve point cap screw. The 2-in-1 Crank Nut is an Invaluable Tool and a Permanent Replacement for the stock balancer bolt & washer or aftermarket balancer bolt kits. Used by numerous professional engine builders, including Pro Stock Engine Builder Steve Schmidt.
Also available for applications that require an extended drive length to accommodate pulleys.