AFR Heads, 2100 BBC AFR 305 Heads, Partially Ported, 117cc

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

50% 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