AFR 180cc SBC "Eliminator" Street Cylinder Head
The Small Port, High Velocity Torque Monster
The Emissions Legal (versions from 1969-94 with heat riser, CARB EO #D-250-2), 180cc intake port small block Chevy "Eliminator" cylinder heads are available in your choice of straight or L98 angle plug versions. These performance 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), 23° 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 72° angle, AFR Part #0919. No special parts are required (see footnotes here). Center bolt valve cover is available as a machine option. Exhaust port and bolt pattern are raised 3/32" over GM L98 cylinder heads, this rarely affects header or chassis fitment.
Hydraulic roller cams typically experience valve float at 6200-6400 rpm because of their fast ramp rates. AFR suggests you upgrade your springs to AFR part #8605, 1.270 O.D. with higher spring pressures and use our Patented “Hydra Rev Kit” to reduce chances of valve float associated with rpm 6200 or higher.
180cc SBC Street Aluminum Cylinder Head Flow Chart
Tested on 4.060 Bore
Basic Package Components
100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
Competition 5-Angle Valve Job
Bead Lock Intake Valve, 2.020" x 4.903" Overall Valve Length
Bead Lock Exhaust Valve, 1.600" x 4.955" Overall Valve Length
PAC Racing Spring 1.290" OD Hydraulic Roller Dual Valve Spring,
135 lbs on seat, .600" maximum lift, Max RPM 6300-6800
Specifications, Features, and Optional Supporting Components
65-70 ft. lbs
Head Torque w/ Moly Lube
55 ft. lbs
Rocker Stud Torque
Intake Port Gasket, 1.230" X 1.990" w/ 3/8" radius, Fel-Pro #1256
Important: Do not port match your intake manifold to Fel-Pro gasket as it does not precisely fit AFR heads.
SB Chevy Head Bolt Kit, ARP #134-3701
SB Chevy Head Stud Kit, 12 Point Nuts, ARP #234-4301
AC FR3LS or 41629
Spark Plug Starting Range
65cc or 75cc
Can be cut to 1.625, no deeper
Standard GM L98
Standard, GM L98
.008" per cc
Angle Mill (Milling options available)
.006" per cc
Flat Mill (Milling options available)
1.7693 sq. in.
Minimum Cross Sectional Area
Note: Angle mills might require .120 thick intake gasket.