Designed for competition big-blocks, this is a Mike Chapman CNC-ported version of the Edelbrock Performer RPM #350-6055 oval port head. 320cc intake port. Capable of 700+ hp on a 468-inch engine with 12.5:1 compression, this head comes with 2.25' intake and 1.90' diameter exhaust valves, both using 11/32' stems in Serdi-machined ductile iron seats. The high-velocity design of these heads is ideal for race and high-performance street. Sold without springs or retainers for a variety of valvetrain combos. Has a minimum cross sectional area of 3.19'.

Tech Tip: To gain more spark plug clearance, Edelbrock recommends using Champion RC Series plugs such as the RC12YC (P/N 192-49776). They are 0.230' shorter than a conventional spark plug and have a 5/8' hex for easier access.