Performer RPM manifolds are dual-plane high-rise intake manifolds with a 180 ° firing order to produce incredible top end horsepower while retaining good throttle response.The larger plenums and runners match free-flowing exhaust high lift cams and other modifications of a high output engine. It is intended for high-performance street or competition engines that run up to 6500 RPM.Designed for street big block Chevys with high performance oval port cylinder heads and a spread bore carburetor. This manifold offers the latest technology in dual plane high rise design. Made in USA This manifold has provi sions for divorced choke H.E.I. late model water neck A/C brackets and alternator. There is no provision for exhaust heated chokes.Use bolt set # E8564 (sold separately).
