HEAD FLOW NUMBERS
INTAKE EXHAUST
.200 138 CFM 110 CFM
.300 198 CFM 158 CFM
.400 240 CFM 190 CFM
.500 260 CFM 207 CFM
AFR 180cc Street Heads, Straight Plug w/heat riser, 75cc 0911
AFR 180cc Street Heads, Straight Plug w/heat riser, 65cc 0916
AFR 180cc Street Heads, L98 Angle Plug w/heat riser, 75cc 0917
AFR 180cc Street Heads, L98 Angle Plug w/heat riser, 65cc 0918
AFR 180cc SBC Street Cylinder Head
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 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.) The 65cc chambers are designed for flat top or dished pistons; domed pistons will require additional machining. Standard valves are 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) This exciting new product mimic’s the GM L98 heads dimensionally and is a direct bolt on. The only exception is the exhaust port is raised .100 to increase performance. It also is available in a straight plug version with the plug location patterned after the GM Vortec head. The head comes with both center bolt and perimeter bolt valve cover patterns. They come with 2.020 - 1.600 8mm valves, #1256 Felpro intake port opening.
Basic Package Components
100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
3-angle Valve Job
AFR 8mm LS1 style Intake Valve, 2.050" standard length
AFR 8mm Ls1 style Exhaust Valve, 1.600" standard length
AFR LS1 Style1.290" OD Hydraulic Dual Valve Spring, 135 lbs. on seat, .600" maximum lift, AFR #8017
10º 4140 Chrome Moly Retainers, AFR #8510
10º Valve Locks, AFR #9005
3/8" Rocker Studs, AFR #6410
Guide Plates, AFR #6105
Valve Seals, AFR #6611
Hardened Shims, AFR #8043
Intake Valve Seats, AFR #9060
Exhaust Valve Seats, AFR #9070
Bronze Valve Guides, AFR #9050
Special orders available upon request.
All Accessory Holes are Predrilled & Tapped!
Specifications, Features, and Supporting Components
Head Torque 65-70 Ft. Lbs.
Rocker Stud Torque 55-60 Ft. Lbs.
Intake Port Gasket, 1.230”x1.990” w/ 3/8" Radius, AFR #6815
Important: Do not port match you intake manifold to this Fel-Pro gasket, as they do not exactly fit AFR heads.
Exhaust Port Gasket Fel Pro #1404, AFR #6834
Head Gasket 350cid Fel Pro #1003, AFR #6800
400cid Fel Pro #1014, AFR #6802
Head Bolts & Studs Standard ARP, AFR #6310 & #6305
Head Bolt Washers Manley, AFR #6320
Stud Girdle AFR #6201
Suggested Manifold Edelbrock #3701, AFR #5029
Spark Plug Starting Range AC FR3LS
Combustion Chambers 75cc or 65cc
Spring Pocket can be cut to 1.625, no deeper.
Valve Spacing Standard
Rocker Arms Standard
Valve Angle 23º
Angle Mill (milling available) .008” per cc
Flat Mill (milling available) .006” per cc
Pushrods 5/16” Hardened AFR #6600 & #6601
Note: Milling head deck will affect flow numbers
