The Small Port, High Velocity Torque Monster!
The AFR Emissions Legal (versions from 1969-94 with heat riser, CARB EO #D-250-2), 180cc intake port small block Chevy cylinder heads are available in your choice of straight or L98 angle plug versions. These cylinder heads feature a 75cc or 65cc combustion chamber with a 64cc exhaust port and a 3/4" thick head deck (ideal for nitrous or blower applications.) Standard valves are lightweight 8mm 2.020 intake and 1.600 exhaust with AFR’s hardened ductile iron interlocking valve seats. The exceptional flow characteristics, ideal operating range of idle to 5500 rpm (higher rpm ranges possible depending on combination of parts), 23º valve angle, and standard valve spacing make this the perfect street aluminum cylinder head for 327 cid to 350 cid engines from 1955-86. Also available for 1987 to present engines with center bolt valve covers and 2 center intake bolts at 72º angle, AFR Part #0919. No special parts are required. Vortec style cylinder heads available also, AFR Part #0912. Dual valve cover bolt pattern is standard.
The exhaust ports are raised .100" over a standard GM L-98 cylinder head.

Note:
Hydraulic roller cams typically experience valve float at 6000-6200 rpm because of their fast ramp rates. AFR suggests you upgrade your springs to AFR part #8019, 1.270 O.D. with higher spring pressures to reduce chances of valve float associated with rpm’s 6200 or higher, but smaller cams with less than .500 lift can rev to 6500 rpm with the included springs.

Basic Package Components	Part #
100% CNC Ported Combustion Chambers 100% CNC Ported Exhaust Ports 100% CNC Ported Intake Ports Competition 3-angle Radiused Valve Job
Bead Lock Intake Valve, 2.020"	AFR #7251
Bead Lock Exhaust Valve, 1.600"	AFR #7250
1.290" OD Dual Hydraulic Roller Valve Spring w/ dampener,	AFR #8017
135 lbs on seat, .600" maximum lift (upgrades available)	Comp Pkg #8019
7° Chrome Moly Retainers	AFR #8514
7° Bead Lock Valve Keepers	AFR #9007
3/8" Rocker Studs	AFR #6410
Guide Plates	AFR #6110
Viton Valve Seals	AFR #6612
Hardened Spring Cup	AFR #8042
Intake Vavle Seats	AFR #9060
Exhaust Vavle Seats	AFR #9070
Bronze Valve Guides	AFR #9051

Specifications, Features, and Optional Supporting Components

Head Torque	65-70 ft. lbs
Rocker Stud Torque	55-60 ft. lbs
Intake Port Gasket, 1.230" X 1.990" w/ 3/8" radius	Fel-Pro #1256, AFR #6817
Exhaust Port Gasket	Fel-Pro #1404, AFR #6834
Head Gasket 350 cid	Fel-Pro #1003, AFR #6800
Head Gasket 400 cid	Fel-Pro #1014, AFR #6802
SB Chevy Head Bolt Kit	ARP #134-3701 AFR #6310
SB Chevy Head Stud Kit, 12 Point Nuts	ARP #234-4301 AFR #6305
Head Bolt Washers, Manley	AFR #6320
Stud Girdle GM L98	AFR #6200
Spark Plug Starting Range	AC FR3LS or 41629
Combustion Chambers	65cc or 75cc
Spring Pocket	Can be cut to 1.625, no deeper
Valve Spacing	Standard GM L98
Rocker Arms	Standard GM L98
Valve Angle	23°
Angle Mill (Milling options available)	.008" per cc
Flat Mill (Milling options available)	.006" per cc

Important: Do not port match you intake manifold to any Fel-Pro gasket as it does not precisely match AFR heads.
Note: Milling head deck will affect flow numbers.