4 Deg Short (3/4in) Crank key

The MR. GASKET 4 Degree Short (3/4 inch) Crank Key is a precision Woodruff crankshaft key engineered for classic V8 and inline-6 engines requiring offset crankshaft timing correction. This copper-coated steel component is designed for use across multiple platform engines, including Chevrolet V8, GM inline-6, Ford inline-6, Pontiac V8, and early Mopar Hemi applications. The 4-degree offset specification allows builders to advance or retard ignition timing during high-performance engine assembly without requiring full crankshaft replacement or complex timing gear modifications.

Measuring 3/16 inch by 3/4 inch, this key fits the standard Woodruff keyway found on classic engine crankshafts. The copper coating provides corrosion resistance while maintaining the mechanical fit integrity required for reliable power transmission between the crankshaft and timing gear. The 4-degree offset is a measured, repeatable specification that enables engine builders to fine-tune ignition advance for optimal performance with period-correct or modern ignition systems. Installation requires proper keyway alignment and standard mechanical assembly practices to ensure the timing gear seats correctly.

This product serves engine builders, hot rodders, and restoration specialists working with classic American muscle cars and vintage performance builds where timing optimization improves throttle response and fuel efficiency. The crank key is a critical wear component during long-term engine operation; replacement during a full rebuild or timing chain service extends the life of the entire ignition system. Sold as a single unit, this MR. GASKET component is a direct fit for applications listed and represents a cost-effective alternative to sourcing original equipment specification keys from multiple manufacturers.