Notes: Cylinder Head 18 BBC 457cc Fully CNC ported 90cc Chambers w/ductile iron seats & steel valves Competition Package Assembled Pair
AFR's new 457cc 18 Big Block Chevy heads are our best performing highest flowing head in our BB Chevy lineup. They come standard with stainless steel 2.400 intake valves and 1.800 exhaust valves. The intake port is raised .500 with the valves rolled to 18 resulting in unparelled under the curve flow numbers..... don't be fooled by just peak flow numbers. The combustion chamber come in at 90cc. This head is ideal for 540CI or larger race engines. This head requires specific pistons, valves covers, shaft mount rockers and readily available intake manifolds.
