RHS Pro Action 23° Cast Iron 235cc Small Block Chevrolet Cylinder Head with 64cc Chambers #12323

New Racing Head Service Pro Action 23° Cast Iron Cylinder Head for a 1955-86 Small Block Chevy V8 Engine. 235cc Intake Runner, 64cc Combustion Chambers, Straight Spark Plug Design. Bare casting that has been fully machined for 2.080 /1.600 valves, .708" reach tapered seat spark plugs, and up to 1.550" diameter valve springs. Designed for street performance, drag racing & circle track applications. RHS Part #12323.