180cc LT1 "Eliminator" 23° Street Head

The Small Port, High Velocity Torque Monster

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 55cc to 65cc combustion chamber with a 64cc exhaust port and a 3/4" thick head deck (ideal for nitrous or blower applications). Standard valves are lightweight 8mm 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 cylinder head for 350 cid to 383 cid performance engines and is specifically designed for 1992-95 Corvettes and 1993-97 Camaros. Center bolt valve cover is available as a machine option. Exhaust port and bolt pattern are raised 3/32" over GM L98 cylinder heads, this rarely affects header or chassis fitment. No special parts are required (see footnotes here).


Hydraulic roller cams typically experience valve float at 6200-6400 rpm because of their fast ramp rates. AFR suggests you upgrade your springs to AFR part #8605, with higher spring pressures to reduce chances of valve float associated with rpm 6200 or higher.

180cc SBC LT Street Aluminum Cylinder Head Flow Chart

Tested on 4.060 Bore

AFR 180cc SBC LT Cylinder Head Flow Chart
Basic Package Components
100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
Competition 5-angle Valve Job
AFR #7251 Bead Lock Intake Valve, 2.020" x 4.903" Overall Valve Length
AFR #7250 Bead Lock Exhaust Valve, 1.600" x 4.955" Overall Valve Length
AFR #8017 PAC Racing Spring 1.290" OD Hydraulic Roller Dual Valve Spring, 140 lbs on seat, .600" maximum lift, Max RPM 6300-6800
AFR #8514 Manley 7° Chrome Moly Retainers
AFR #9007 7° Bead Lock Valve Keepers
AFR #6410 3/8" Rocker Studs
AFR #6103 Adjustable Guide Plates
AFR #6612 Viton Valve Seals
AFR #8042 Hardened Spring Cup
AFR #9060 Intake Valve Seats
AFR #9070 Exhaust Valve Seats
AFR #9051 Bronze Valve Guides

Specifications, Features, and Optional Supporting Components
65-70 ft. lbs Head Torque w/ Moly Lube
55 ft. lbs Rocker Stud Torque
GM #12524653 LT1/Fel-Pro #1284 Intake Port Gasket
Important: Do not port match your intake manifold to Fel-Pro/GM LT1 gasket as it does not precisely fit AFR heads.
AFR #6834 Exhaust Port Gasket, Fel-Pro #1404
AFR #6803 Head Gasket, 350cid Fel-Pro #1074
AFR #6310 SB Chevy Head Bolt Kit, ARP #134-3701
AFR #6305 SB Chevy Head Stud Kit, 12 Point Nuts, ARP #234-4301
AFR #6320 Head Bolt Washers, Manley
AFR #6200 Stud Girdle GM L98
GM LT1 Suggested Manifold
AC FR3LS or 41629 Spark Plug Starting Range
55cc to 65cc Combustion Chambers
Can be cut to 1.625, no deeper Spring Pocket
Standard GM L98 Valve Spacing
Standard, GM L98 Rocker Arms
23° Valve Angle
.008" per cc Angle Mill (Milling options available)
.006" per cc Flat Mill (Milling options available)
1.7693 sq. in. Minimum Cross Sectional Area
5.5649" Runner length
 Model      Product Name   Price   Buy Now 
 0908*   SBC 180cc LT1 Reverse Cool Heads, (Specify chamber size 55cc - 65cc) L98 angle plug, complete w/parts   SBC 180cc LT1 Reverse Cool Heads, (Specify chamber size 55cc - 65cc) L98 angle plug, complete w/parts   $1,940.00  Buy Now 
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Air Flow Research | 28611 W. Industry Drive | Valencia, CA 91355 | 661-257-8124

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