93-97 LT1 AFR 180cc Street Heads


Model Number: 908/909
Air Flow Research

The AFR Emissions Legal (CARB EO #D-250-2 for engines up to 1994), 180cc intake port LT1 small block Chevy cylinder heads are available in the LT1 angle plug version only. These heads feature a 56cc to 74cc combustion chamber with a 64cc exhaust port and a 3/4? thick head deck (ideal for nitrous or blower applications). 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 6000 rpm (higher rpm ranges possible depending on combination of parts), 23? valve angle, and standard valve spacing make this the perfect street head for 350 cid to 383 cid engines and is specifically designed for 1993-97 Camaros. No special parts are required.

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.

These models with a heat riser are emissions legal. Heads are sold as a set.

Basic Package Components

100% CNC Ported Combustion Chambers

100% CNC Ported Exhaust Ports

70% to 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 #8506

10? Valve Locks, AFR #9006

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, 1.250? x 2.040? with 3/8? radius, AFR #6827

Important: Do not port match your 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 350 cid Fel Pro #1074, AFR #6803

Head Bolts & Studs Standard ARP, AFR #6310 & #6305

Head Bolt Washers Manley, AFR #6320

Stud Girdle AFR #6201

Suggested Manifold GM LT1

Spark Plug Starting Range AC FR3LS

Combustion Chambers 56cc to 74cc

Spring Pocket can be cut to 1.625, no deeper.

Valve Spacing Standard

Rocker Arms Standard

Valve Angle 23?

Angle Mill .008? per cc

Flat Mill .006? per cc

Pushrods 5/16? Hardened AFR #6606

Please choose your selection in the drop-down menu below:

908 – CNC Street Porting, 180cc Reverse Cool Heads, Angle Plug Type, 56-74cc (please specify), complete w/parts.

909 – CNC Competition Package Street Porting, 180cc Reverse Cool Heads, Angle Plug Type, 56-74cc (please specify), complete w/parts.


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SKU: 908/909 Category: