New from AFR – the 457cc 18° Big Block Chevy cylinder heads. These heads are the best performing highest flowing head in their BB Chevy lineup and are ideal for 540ci or larger race engines. See more details below.

Official Release:

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. AFR offers a wide range of options and upgrades for this head like titanium valves and Copper seats.

Features:

• Stainless steel 2.400 intake valves and 1.800 exhaust valves
• Intake port is raised .500 with the valves rolled to 18°
• Ideal for 540ci or larger race engines