If "Dirty Harry" drove a racecar, it would certainly be fitted with a pair of AFR 357cc "Magnum" cylinder heads. If huge horsepower is what you are searching for, either of these castings will certainly deliver. With fully CNC ported 357cc flowing 425 CFM, these cyilnder 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 cyilnder 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). As well, these aluminum heads provide impressive torque figures at higher rpm levels. Blown, turbo, and nitrous engines will especially like the larger, higher flowing intake ports. AFR BBC 357cc cylinder 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 cylinder 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 for our 357cc BBC. Properly selecting the correct cylinder head depends on a large number of variables.

• 5-angle valve job
• 100% CNC Ported Chambers, Exhaust, and Intake
• Intake Valve, 2.300" stainless steel
• Exhaust Valve, 1.880" stainless steel
• 1.625 O.D. Roller Dual Valve Spring with dampener 255 lbs. on seat, .750" maximum lift
• 10° Titanium Retainer
• 10° Valve Locks
• Guide Plates
• Viton Valve Seals
• Hardened Spring Cup
• Intake Valve Seats
• Exhaust Valve Seats
• Bronze Valve Guides Intake
• Bronze Valve Guides Exhaust
• AFR BB Chevy 7/16 Exhaust Studs
• AFR BB Chevy 7/16 Intake Studs