AFR's 335cc BBC Enforcer Cylinder heads feature our Permanent Mold "As-Cast" Technologysurfaces 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 guide plates, machined bead valve locks (not stamped), hardened spring seats and our one piece 8mm 214N Stainless Steel valves. They are available without anyparts for the DIY. Sold as a single piece, 2 are required per engine.

Included Components
3-angle Valve Job
As Cast Combustion Chambers
As Cast Exhaust Ports
As Cast Intake Ports
11/32" Intake Valve, 2.250" x 5.500" O.A.L
11/32†Nail Head ExhaustValve, 1.880" x 5.450" O.A.L
PAC Racing #1940 1.550" OD Hydraulic Roller Dual Valve Spring 175 lbs. on seat, .725" maximum lift, Max RPM 6500-6700
10° Steel Retainers 1.500" O.D x 1.120" I.D x .705" I.D
10° 11/32" Valve Locks with lashcap recess
ARP 7/16" Rocker Exhaust Studs
ARP 7/16" Rocker Intake Studs
3/8" Guide Plates
11/32" Viton Valve Seals
Hardened Valve Spring I.D Locator 1.550"O.D x .705" I.D