Edelbrock designed this 61525 Performer RPM CNC Cylinder Head for 1962-79 389, 400, 421, 428 as well as 455 CID V8 Pontiac engines. It features CNC profiled intake and exhaust runners, as well as fully CNC’d 87cc combustion chambers. This head features extra thick port walls and a compact port size, making it ideal for CNC as well as hand porting! Fully threaded inserts for the rocker studs and exhaust manifold bolt holes deliver strength as well as durability, and the machined valve cover rail produces an optimum gasket sealing surface. Optimized oil return passages provide increased oil flow. 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. Edelbrock 61525 Pontiac 455 Performer RPM CNC Cylinder Head Features: Combustion Chamber Volume: 87cc Intake Runner Volume: 215cc Exhaust Runner Volume: 175cc Intake Port Shape: Rectangular Intake Valve Diameter: 2.110 in. Exhaust Valve Diameter: 1.660 in. Maximum Valve Lift: 0.575 in. Camshaft Style: Hydraulic Roller Outside Diameter of Outer Spring: 1.460 in. Deck Thickness: 0.625 in. Deck Height: 10.250 in. Rocker Stud Diameter: 0.4375 in. Pushrod Diameter: (Suggested) 0.3125 in. Sold Individually Notes: Requires Edelbrock head bolt kit 8549 for installation. 350 CID engines may require notching the block for valve clearance. 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 and performance world!
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