If huge horsepower is what you are searching for, these castings will certainly deliver. Our fully CNC ported 357cc flowing 425 CFM, these heads represent the ultimate in airflow for your BB Chevrolet. Our 357 “Magnum� flows over 415 CFM @ .700 valve lift! No other production style BB Chevy head even comes close. These heads were targeted at larger cubic inch engines (509-632 CID) looking for maximum horsepower and rpm capability with a primary operating range of 3500-8000 rpm’s (This range is an average and will vary with engine displacement and component selection). These heads will also provide impressive torque figures at higher rpm levels. Blown, turbo, and nitrous engines will especially like the larger, higher flowing intake ports.Both of these heads will work best with camshafts exceeding .750 gross valve lift to make better use of the substantial airflow found in the higher lift range. The 357cc come standard with AFR’s trademark .750� thick head deck, reinforced rocker stud bosses, and are equipped with premium one piece stainless steel 2.300� intake valves and 1.880� exhaust valves. Standard combustion chamber volume is 121cc chamber.

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