Edelbrock 61555 Marine Cylinder Head Hydraulic Roller Cam for Big Block Chevy

RPM Marine Big-Block Chevy Cylinder Head Hydraulic Roller Cam The Edelbrock #61555 Performer RPM Marine-Duty cylinder head is designed for use with Rectangular Port Big-Block Chevy Marine applications. This cylinder head delivers great throttle response and power from 1500 to 6500 rpm. They also feature the highest quality intake and exhaust valves and valve springs. For use on pre-pollution controlled vehicles only.