Description
Air Flow Research 165cc “Street” cylinder heads are the preferred choice over re-worked factory heads. They feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings and high quality components throughout, in addition these are the only AFR heads that are compatible with the OEM piston valve relief. Recommended for street, towing, or street/strip engines with displacements up to 351 cubic inches, operating up to 6000 RPM. Legal for 1995 and older emissions controlled vehicles under CARB EO #D-250-3
100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
Competition 5-angle Valve Job
8mm Bead Lock Intake Valve, 1.900″ x 4.900″ O.A.L
8mm Bead Lock Exhaust Valve, 1.600″ x 4.950″ O.A.L
Pedestal 8mm Bead Lock Intake Valve, 1.900″ x 5.080″ O.A.L
Pedestal 8mm Bead Lock Exhaust Valve, 1.600″ x 5.100″ O.A.L
PAC Racing Spring 1.290″ OD Hydraulic Roller Dual Valve Spring, 140 lbs on seat, .600″ maximum lift, Max RPM 6300-6500 (upgrades available)
7° Manley Steel Retainers 1.245″ O.D x .885″ I.D x .655″ I.D
7° Bead Lock Valve Keepers
ARP 3/8″ Rocker Studs
Adjustable 5/16″ Guide Plates
Viton Valve Seals .600″ O.D x .495″ I.D
Hardened Valve Spring O.D Locator 1.380″ O.D x .570″ I.D
Ductile Iron Intake Valve Seats 2.131″ O.D x 1.680″ I.D x .375″ Deep
Ductile Iron Exhaust Valve Seats 1.650″ O.D x 1.350″ I.D x .375″ Deep
8 mm Bronze Valve Guides .502″ O.D x 2.100″ O.A.L
Thermactor Air Injector Reducer Bushing (5/8″-11 x 7/16″-14)
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