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AFR 357cc Magnum BBC Cylinder Heads

If huge horsepower is what you are searching for, AFR 357cc Magnum aluminum cylinder heads will certainly deliver. With AFR's fully CNC-ported 357cc heads flowing 425 cfm, they represent the ultimate in airflow for your big block Chevrolet. These cylinder heads were targeted at larger cu. in. engines (509-632 c.i.d.) looking for maximum horsepower and rpm capabilities with a primary operating range of 3,500-8,000 rpm (this range is an average and will vary with engine displacement and component selection). These aluminum heads also provide impressive torque figures at higher rpm levels. Blown, turbo, and nitrous engines will especially like the larger, higher flowing intake ports. AFR 357cc Magnum BBC cylinder heads will work best with camshafts exceeding 0.750 in. gross valve lift to make better use of the substantial airflow found in the higher lift range. The AFR 357cc heads come standard with AFR's trademark 3/4 in. thick cylinder head deck, reinforced rocker stud bosses, and premium one-piece stainless steel 2.300 in. intake and 1.880 in. exhaust valves. The AFR's fully CNC-ported 357 heads come with a 121cc chamber and are available with an optional 114cc combustion chamber as well. Order the cylinder head model suited to your needs.

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$5,184.90

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AFR 377cc Magnum BBC Competition Racing Heads

AFR 377cc Magnum BBC Competition racing heads feature 100 percent CNC-ported intakes, exhausts, and chambers; A356 aluminum castings, Titanium retainers, and high-quality components throughout. These Magnum BBC heads are best suited for large displacement (540 plus) racing engines operating at or below 7600 rpm. They are available assembled and bare. AFR assembled 377cc Magnum BBC heads typically include: * 11/32 in. intake valves * 11/32 in. Tulip exhaust Valves * PAC Racing Spring 1.625 O.D. Solid Roller, 275 lbs. on seat, .850 maximum lift * 10 degree Titanium retainers * 10 degree 11/32 in. valve locks with lash cap recess * ARP 7/16 in. rocker intake and exhaust studs * Adjustable 3/8 in. guide plates * 11/32 in. Viton® valve seals * Hardened spring cup * Intake and exhaust valve seats * 11/32 in. intake and exhaust bronze valve guides

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$5,344.50

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