Air Flow Research

Air Flow Research (AFR) Aluminum Cylinder Heads for 87-95 5.0L Mustang. Works with stock bottom end vehicles. AFR's 165cc Renegade cylinder heads are the preferred choice over re-worked factory...

AFR's 185cc "Street" cylinder heads feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings and high quality components throughout. Recommended for engines from 302-393 cubic...

Recommended for displacements up to 408 cubic inches, operating up to 6500-6800 RPM, our 195cc "Competition" cylinder heads feature 100% CNC machined intake ports, exhaust ports and combustion...

AFR's 205cc "Competition" cylinder heads feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings and high quality components throughout. Recommended for race applications and...

Our largest and highest flowing head for the small block ford is the best in-line head money can buy. Featuring 220cc intake runners, this package is recommended for race applications and radical...

AFR's 185cc SB Ford Enforcer Cylinder heads feature our Permanent Mold “As-Cast” Technology surfaces on the intake runners, exhaust runners and combustion chambers that allows for...

1.29" outer diameter, 1.800" install height, inner spring inside diameter .685" Seat pressure 155lb @ 1.800", open pressure 448lb @ 1.160"   MAX LIFT .650"Dual Springs Made by PAC...