Recommended for agressive street or street/strip applications with displacements up to 540 cubic inches, operating at or below 6800 RPM. Featuring fully CNC machined intake runners, exhaust ports and combustion chambers. These heads are capable of flowing 387 CFM at 0.800" of lift.

Test conducted at 28" of water (pressure) on Superflow 1020
Bore Size: 4.600", 3/4" radius plate exhaust, 2 1/8" curved pipe

Recommended for radical "Pro Street" or racing applications with displacements up to 605 cubic inches, operating at or below 7400 RPM. AFR's 357cc cylinder heads features fully CNC machined intake runners, exhaust ports and combustion chambers; capable of flowing 425 CFM at 0.800" of lift. These cylinder heads now come standard with Titanium retainers.
 

Test conducted at 28" of water (pressure) on Superflow 1020
Bore Size: 4.600", intake 3/4" radius plate exhaust, 2 1/8" curved pipe

Recommended for radical streep/strip or "Pro Street" applications with displacements up to 572 cubic inches, operating at or belwo 7000 RPM. Featuring fully CNC machined intake runners, exhaust ports and combustion chambers; these heads are capable of flowing 410 CFM at 0.800" of lift.
 

Test conducted at 28" of water (pressure) on Superflow 1020
Bore Size: 4.600", intake 3/4" radius plate exhaust, 2 1/8" curved pipe

Best suited for +540 cubic inch large displacement big block chevy racing engines, operating at or below 7600 RPM. Our 37cc cylinder heads feature fully CNC machined intake runners, exhaust ports and combustion chambers. Equipped with Titanium retainers and high quality components, these heads are capable of flowing 437 CFM at 0.900" of lift.

Test conducted at 28" of water (pressure) on Superflow 1020
Bore Size: 4.600", intake 3/4" radius plate exhaust, 2 1/8" curved pipe

Our largest and best flowing 24° big block chevy cylinders heads, these cylinder heads feature 100% CNC machined intake runners, exhaust ports and combustion chambers. Best suited for +540 cubic inch large displacement racing engines, operating at or below 7600 RPM. Equipped with Titantium retainers and high quality components, these heads are capable of flowing 456 CFM at 0.900" of lift.

Test conducted at 28" of water (pressure) on Superflow 1020
Bore Size: 4.600", intake 3/4" radius plate exhaust, 2 1/8" curved pipe

AFR's 335cc BBC Enforcer Cylinder heads feature our Permanent Mold “As-Cast” Technology surfaces on the intake runners, exhaust runners and combustion chambers that allows for extremely accurate and repeatable port location/performance. This budget friendly head  is perfect for your 509 to 540 Cubic Inch operating below 6500 RPM. They come fully assembled with the identical components found in our higher end CNC ported cylinder heads; such as ARP rockers studs, PAC Racing springs, viton valve seals, AFR adjustable guide plates, machined bead valve locks (not stamped), hardened spring seats and our one piece 8mm 21 4N Stainless Steel valves. They are available without any parts for the DIY. Sold as a single piece, 2 are required per engine.
 

Test conducted at 28" of water (pressure) on Superflow 1020
Bore Size: 4.060", 3/4" radius plate exhaust, 1 3/4" curved pipe

Recommended for more aggressive street or street/strip big block Chevy applications with displacements up to 540 cubic inches, operating at or below 6800 RPM. The 325cc magnum cylinder head intake runners and exhaust ports are partially CNC machined, while the combustion chambers are offered with partial or full CNC machining with a bowl blend. Capable of flowing 390 CFM at 0.700" of lift.

Test conducted at 28" of water (pressure) on Superflow 1020
Bore Size: 4.310", intake 3/4" radius plate exhaust, 2 1/8" curved pipe

Recommended for moderate street or street/strip applications with displacements up to 509 cubic inches, operating at or below 6500 RPM. The intake runners and exhaust ports are partially CNC machined, while the combustion chambers are offered with partial or full CNC machining with a bowl blend. These 305cc big block Chevy magnum cylinder heads are capable of flowing 368 CFM at 0.700" of lift.

Test conducted at 28" of water (pressure) on Superflow 1020
Bore Size: 4.310", 3/4" radius plate exhaust, 2 1/8" curved pipe

AFR's 345cc BBC cylinder head is recommended for radical street/strip, "Pro Street," or racing applications with displacements up to 572 cubic inches, operating at or below 7000 RPM. The intake runners and exhaust ports are partially CNC machined, while the combustion chambers are offered with partial or full CNC machining with a bowl blend. These heads are capable of flowing 401 CFM at 0.700" of lift.
 

Test conducted at 28" of water (pressure) on Superflow 1020
Bore Size: 4.500", intake 3/4" radius plate exhaust, 2 1/8" curved pipe

Our medium sized 290cc oval port cylinder head is recommended for moderate street or street/strip big block chevys with displacements up to 509 cubic inches, operating at or below 6500 RPM. Features 100% CNC machined intake runners , exhaust ports and combustion chambers; capable of flowing 375 CFM at 0.700" of lift.
 

Test conducted at 28" of water (pressure) on Superflow 1020
Bore Size: 4.310", intake 3/4" radius plate exhaust, 1 7/8" curved pipe

Recommended for agressive street, street/strip or race big block chevys with displacements up to 540 cubic inches operating at or below 6800 RPM. The 300cc oval port cylinder heads feature 100% CNC machined intake runners, exhaust ports and combustion chambers; our 300cc oval port flows 388 CFM at 0.700" lift and is the ultimate street/race weapon without having to step up to a rectangular port design.
 

Test conducted at 28" of water (pressure) on Superflow 1020
Bore Size: 4.500", 3/4" radius plate exhaust, 1 7/8" curved pipe

Our small port, high velocity 265cc cylinder heads are a cost effective choice compared to re-worked factory big block chevy cylinder heads. The intake runners and exhaust ports are partially CNC machined, while the combustion chambers are offered with partial or full CNC machining with a bowl blend; this torque monster is capable of flowing 354 CFM at 0.650" lift. Recommended for street, street/strip and towing applications with displacements up to 468 cubic inches operating at or below 6200 RPM.
 

Test conducted at 28" of water (pressure) on Superflow 1020
Bore Size: 4.310", intake 3/4" radius plate exhaust, 1 7/8" curved pipe

AFR’s new 457cc 18° Big Block Chevy cylinder heads are our best performing highest-flowing heads in our BB Chevy lineup. They come standard with stainless steel 2.400 intake valves and 1.800 exhaust valves.
The intake port is raised .500 with the valves rolled to 18° resulting in unparalleled under the curve flow numbers..... don’t be fooled by just peak flow numbers. The combustion chamber come in at 90cc. This head is ideal for 540CI or larger race engines. This head requires specific pistons, valves covers, shaft mount rockers and readily available intake manifolds. AFR offers a wide range of options and upgrades for this head like titanium valves and Copper seats.

Test conducted at 28" of water (pressure) on Superflow 1020
Bore Size: 4.625", 3/4" intake radius plate, 2 1/8" curved pipe exhaust