Description
The Air Flow Research cylinder head is 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
100% CNC Ported Combustion Chambers
20% CNC Ported Exhaust Ports
30% CNC Ported Intake Ports
Competition 5-angle valve job
11/32″ Intake Valve, 2.250″ x 5.500″ O.A.L
11/32″ Nail Head Exhaust Valve, 1.880″ x 5.450″ O.A.L
PAC Racing Spring 1224 1.625 O.D. Solid Roller, 275lbs on seat, .850 Maximum Lift, Max RPM 7400-7600
Manley 10° Steel Retainers 1.500″ O.D x 1.168″ I.D x .844″ I.D
10° 11/32″ Valve Locks with lashcap recess
ARP 7/16″ Rocker Exhaust Studs
ARP 7/16″ Rocker Intake Studs
Adjustable 3/8″ Guide Plates
11/32″ Viton Valve Seals
Hardened Spring Cup 1.740″ O.D / 1.650″ I.D
Intake Valve Seats 2.450″ O.D x 2.000″ I.D x .375″ Deep
Exhaust Valve Seats 2.000″ O.D x 1.580″ I.D x .375″ Deep
11/32″ Intake Bronze Valve Guides .502″ O.D x 2.10″ O.A.L
11/32″ Exhaust Bronze Valve Guides .502″ O.D x 2.25″ O.A.L
