| The AFR Emissions Legal (versions from 82-92 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 74cc or 68cc combustion chamber with a 64cc exhaust port and a 3/4” thick head deck (ideal for nitrous or
blower applications.) The 68cc 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), 23º valve angle, and standard valve spacing make this the perfect street 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. No special parts are required. Vortec style head available too.
Note: Hydraulic roller cams typically experience valve float at 5800-6000 rpm because of their fast ramp rates. AFR suggest you upgrade your springs to AFR part #8032, 1.530 O.D. with higher spring pressures and use our Patented “Hydra Rev Kit” to reduce chances of valve float associated with rpm 6000 or higher.
Note: Heads are sold as a set. Available with parts ready to install. Please choose in the drop-down menu below. All of the heads listed here are emissions legal in all 50 states.
Basic Package Components
100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
3-angle Valve Job
Intake Valve, 2.020" standard length, AFR #7204
Exhaust Valve, 1.600" standard length, AFR #7219
1.450" OD Hydraulic Dual Valve Spring, 120 lbs. on seat, .550" maximum lift, AFR #8020
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 74cc or 68cc
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
Please choose your selection in the drop-down menu below:
CNC Street Porting:
| Part # |
Plug Type |
Chamber Size |
| 0912 |
Vortec |
74cc |
| 0913 |
Factory Straight |
74cc |
| 0911 |
Straight |
74cc |
| 0916 |
Straight |
68cc |
| 0917 |
L98 |
74cc |
| 0918 |
L98 |
68cc |
CNC Competition Package Street Porting:
| Part # |
Plug Type |
Chamber Size |
| 0985 |
Straight |
74cc |
| 0988 |
L98 |
74cc |
| 0989 |
Vortec |
74cc |
| 0990 |
Factory Straight |
74cc |
| 
Shopping Cart