82-92 5.0/5.7L AFR 180cc Street Heads

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), 23? 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 72? 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

10? 4140 Chrome Moly Retainers, AFR #8510

10? 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 23?

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:

CNC Competition Package Street Porting: