Edelbrock designed this 60555 BBC Performer RPM Cylinder Head for 396-502 Big Block Chevy engines. This Semi-Open chamber Rectangle Port cylinder head is perfect for street performance, daily drivers, street rods as well as muscle cars where seat-of-the-pants performance is needed. This cylinder head delivers great throttle response as well as power from 2500 to 7000 rpm. Fully threaded inserts for the rocker studs and exhaust manifold bolt holes deliver strength as well as durability. Also, the machined valve cover rail produces an optimum gasket sealing surface. This complete cylinder head includes guide plates, rocker studs, springs for hydraulic roller cams, bronze valve guides, hardened seats as well as high-quality stainless steel valves for direct bolt-on application. For use on pre-pollution-controlled vehicles only. Edelbrock 60555 BBC Performer RPM Rectangle Port Cylinder Head Features: Combustion Chamber Volume: 118cc Intake Runner Volume: 315cc Exhaust Runner Volume: 110cc Intake Port Shape: Rectangle Exhaust Port Shape: Square Intake Valve Diameter: 2.190 in. Exhaust Valve Diameter: 1.880 in. Maximum Valve Lift: 0.700 in. Camshaft Style: Hydraulic Roller Outside Diameter of Outer Spring: 1.550 in. Deck Thickness: 0.5625 in. Deck Height: 10.20 in. Rocker Stud Diameter: 0.4375 in. Pushrod Diameter: (Suggested) 0.4375 in. Sold Individually Notes: Spark plug location has been moved .150 closer to the bore center. Please check clearance if using a domed piston. The Edelbrock name has been a staple of the automotive performance industry since the 1940’s. Their product line includes virtually everything under the hood, from individual components to complete engines. This makes Edelbrock one of the most recognized and trusted brands in the racing as well as the performance world!
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