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

• O.D. Spring Cup 1.655 OD x 1.565 ID x .570 ID
• Fits 8000, 8001, 8002, 8016 for BBC/BBF
• (1 Piece) or (Set of 16)

• Solid Roller Spring 1.625 O.D. w/Electroplate Polishing
• 275 lbs. on seat
• .850” max lift
• Max RPM 7400-7600
• Steel Retainer: 8518
• Titanium Retainer: 8507
• BBC Valve Lock: 9005
• BBF Valve Lock: 9010
• (1 Piece) or (Set of 16)

• Tulip Inconel Exhaust Valve
• 11/32" Stem Diameter
• 1.880” x 5.450” O.A.L.
• (1 Piece) or (Set of 8)

• Stainless Steel High Perf. Tulip Exhaust Valve
• 1 pc. chrome stem
• Swirl Polished
• 11/32" Stem Diameter
• 1.880” x 5.450” O.A.L.
• (1 Piece) or (Set of 8)

• Stainless Steel High Perf. Nail Head Exhaust Valve
• 1 pc. chrome stem
• Swirl Polished
• 11/32" Stem Diameter
• 1.880” x 5.450” O.A.L.
• (1 Piece) or (Set of 8)

• BBC Stainless Steel High Perf. Valve
• 1 pc. chrome stem
• swirl polished
• 2.300 x 5.500 OAL
• 11/32" Stem Diameter
• (1 Piece) or (Set of 8)

• BBC Stainless Steel High Perf. Valve
• 1 pc. chrome stem
• swirl polished
• 2.250 x 5.500 OAL
• 11/32" Stem Diameter
• (1 Piece) or (Set of 8)

• AFR Adjustable Guide Plates
• BBC
• (1 Piece) or (Set of 8)

• BBC Adjusting Nuts
• Intake Only
• (1 Piece) or (Set of 8)

• Requires AFR #6611 Valve Stem Seal
• AFR BBC Exhaust Guide
• AFR BBF Intake & Exhaust Guide
• (1 Piece) or (Set of 8)

• Requires AFR #6611 Valve Stem Seal
• AFR BBC Intake Guide
• (1 Piece) or (Set of 8)

• 10 degree Valve Locks for 11/32" valve stem diameter
• (1 Piece) or (Set of 16)

• Titanium 10 degree Retainer 1.490 OD x 1.180 ID x .765 ID
• For BBC & BBF with spring 8022 or 8031
• BBC require AFR #9005 Bead Lock Keepers
• BBF require AFR #9010 Bead Lock Keepers
• (1 Piece) or (Set of 16)

• O.D. Spring Cup 1.740 OD x 1.650 ID x .570 ID
• Fits Springs 8031, 8022, & 8023 for BBC/BBF
• (1 Piece) or (Set of 16)

• BBC Stainless Steel High Perf. Valve
• 1 pc. chrome stem
• swirl polished
• 2.190 11/32 Stem
• (1 Piece) or (Set of 8)

• BBC Stainless Steel High Performance Valve
• 1pc. Chrome stem
• Swirl Polished
• 11/32" Stem Diameter
• 2.350" x 5.500" OAL
• (1 Piece) or (Set of 8)

• 10 degree Manley Steel Retainers 1.500" O.D x 1.168" I.D x .844" I.D
• Comes standard on BBC/BBF using spring #8031
• BBC require AFR #9005 Square Lock Keepers
• BBF require AFR #9010 Bead Lock Keepers
• (1 Piece) or (Set of 16)

AFR 8517 10° titanium retainer is for use with spring AFR 8014 and requires AFR 9005 bead lock keepers.

(1 Piece) or (Set of 16)

AFR's 8014 spring is our badest spring offering, up to .900" max lift and 8500 RPM.

• 1.645” OD Solid Roller Triple Drag Race Spring
• 385 lbs. on seat
• .900” max lift
• Max RPM 8300-8500
• Titanium Retainer: 8517
• BBC Valve Lock: 9005
• BBF Valve Lock: 9010
• (1 Piece) or (Set of 16)

• Requires AFR #6613 Valve Stem Seal
• AFR BBC Exhaust Guide
• AFR BBF Intake & Exhaust Guide
• (1 Piece) or (Set of 8)

• Requires AFR #6613 Valve Stem Seal
• AFR BBC Intake Guide
• (1 Piece) or (Set of 8)

• High Quality ARP Stud
• BBC Intake 7/16" Rocker Stud Replacement
• BBF Intake & Exhaust 7/16" Rocker Stud replacement
• (1 Piece) or (Set of 8) or 16

• ARP BBC Exhaust 7/16" Rocker Stud
• (1 Piece) or (Set of 8)

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

• 10 degree Valve Locks for 11/32" valve stem diameter
• With Lashcap Recess
• For AFR BBF and BBC 18° Valves
• Product color might differ from picture
• 1 piece or set of 16

• 1.640 O.D. Solid Roller Valve Spring
• Manley Nextek #221425-16
• 320 lbs. on seat
• .840” max lift
• Max RPM 8200-8400
• Titanium Retainer: 8507
• BBC Valve Lock: 9005
• BBF Valve Lock: 9010
• (1 Piece) or (Set of 16)