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The 4-Pattern cam is based on the concept of equalizing airflow on a V8 engine equipped with a 4-barrel or single-throttle-body intake manifold that has unequal-length runners. Typically, the runners serving the four outboard cylinders are about 10 % longer than the runners serving the inboard cylinders.  Drawing from years of NASCAR experience, the 4-Pattern cam has four different lobe patterns, with separate intake and exhaust profiles for the inboard and outboard cylinders. 

4-Pattern cams are available for the small-block Chevy and Ford and big-block Chevys.  Applications include drag racing, road racing and circle track as well as street performance. The 4-Pattern technology is not intended for engines with tunnel-ram or box-style intake manifolds that don’t have unequal-length runners. It will work on both single and dual-plane 4-barrel intakes.

These new grinds incorporate four different lobe sets specifically designed to equalize airflow between all the runners on contemporary 4-barrel intake manifolds. Matched against a comparable hydraulic roller, the Comp 4-Pattern cams can offer gains of 5 to 20 horsepower with the bonus of up to 1,000 more useable rpm–a worthy achievement for cams using relatively heavy hydraulic roller lifters.

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