Racers and street enthusiasts looking for an affordable cast-iron big-block Chevy cylinder head that can support over 850 horsepower right out of the box can rejoice as EngineQuest (EQ) has just expanded their product line. EQ’s big-block Chevy replacement cylinder heads surpass any production unit by producing outstanding horsepower and torque improvements for virtually all big-block Chevy engines from a mild 454, to a supercharged 572.
These heads offer superior flow characteristics and are available with either a 320cc or 360cc intake runner. They are cast, machined, and assembled with great features such as multi-angled intake seats and radiused exhaust valve seats, revised water jackets for better thermal conductivity and reduced chance of detonation, thick deck surfaces, hardened exhaust valve seats, and manganese intake and bronze exhaust valve guides. These heads also have a 119cc chamber volume that is compression friendly for street applications. Part numbers for the new big-block Chevy heads are CH454A for 320cc intake runner, and CH454B for the 360cc intake runner.