| 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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