AFR Big Block Chevy 357cc Rectangle Port Magnum Aluminum Cylinder Heads
AFR’s 357 MAGNUM…The Name Says It All.
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, this castings will certainly deliver. With the fully CNC ported 357cc flowing 425 CFM it can produce upwards of 900 HP. This cyilnder head was targeted at larger cubic inch engines, 509-632ci, 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, so higher reving 450+ cubic inches can benefit from the efficient runner. 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” (3/4”) thick cylinder head deck, reinforced rocker stud bosses, premium one-piece stainless steel 2.300” intake valves and 1.880” exhaust valves. Standard combustion chamber volume is 121cc for the 357cc BBC and can be milled as low as 102 cc’s if necessary. Take note the higher flowing exhaust ports and bolt pattern are raised .375” (3/8”) over stock location, this rarely affects header or chassis fitment. Made in USA.
Installation Notes: Optional stud girdle required for 2° rolled valve angles and 1” longer head bolt needed on four bottom exhaust bolt holes. Longer pushrods may also be required.
357cc Rectangle Port Magnum Cylinder Head Features:
- 100% CNC Ported Combustion Chambers
- 100% CNC Ported Exhaust Ports
- 100% CNC Ported Intake Ports
- Competition 5-angle Valve Job
- 357cc Intake Ports
- Intake Valve, 2.300” x 5.500” Overall Valve Length
- Exhaust Valve, 1.880” x 5.442” Overall Valve Length
- 1.625” OD PAC Racing Solid Roller Valve Spring, 275 lbs on seat, .850” maximum lift
- 10° Manley 4140 Chrome Moly Retainers
- 10° Valve Locks
- 7/16” Rocker Studs
- Adjustable 3/8” Guide Plates
- Viton Valve Seals
- Hardened Spring Seats
- Intake Valve Seats
- Exhaust Valve Seats
- Bronze Valve Guides
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