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AFR - Airflow Research 908
180cc LT1 Eliminator Street Aluminum Cylinder Heads SB-Chevy
033-908
AFR - Airflow Research 908 Details
Small Block Chevy 180cc LT1 Eliminator Basic Package Components
100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
Competition 5-Angle Valve Job
Intake Valve, 2.020'' x 4.903'' o.a.l.
Exhaust Valve, 1.600'' x 4.955'' o.a.l.
1.290'' OD Hydraulic Roller Dual Valve Spring, 135 lbs. on seat, .600'' maximum lift, max RPM 6300-6500
7º Titanium Retainers
7º Valve Locks
3/8'' Rocker Studs
Adjustable 5/16'' Guide Plates
Viton Valve Seals
Hardened Spring Cups
Intake Valve Seats
Exhaust Valve Seats
Bronze Valve Guides
Small Block Chevy 180cc LT1 Eliminator Street Head Specifications
Head Torque w/Moly Lube
65-70 Ft. Lbs.
Rocker Stud Torque
55 Ft. Lbs.
Intake Port Gasket
Fel-Pro 375-1284 - DO NOT PORT MATCH Intake Manifold to Fel-Pro Gasket.
Exhaust Port Gasket
Fel Pro 375-1404
Head Gasket
350ci Fel Pro 375-1074
Head Bolts & Studs
Standard ARP
Head Bolt Washers
Manley Standard
Stud Girdle
Standard GM L98
Suggested Manifold
GM LT1
Spark Plug Starting Range
AC FR3LS or 41629
Combustion Chambers
55 to 65cc
Spring Pocket can be cut to 1.625, no deeper.
Valve Spacing
Standard GM L98
Rocker Arms
Standard GM L98
Valve Angle
23°
Angle Mill
.008'' per cc
Flat Mill
.006'' per cc
Specifications:
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 diameter stem, 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 350-383ci performance engines and is specifically designed for 1992-95 Corvettes and 1993-97 Camaros. No special parts are required (see footnotes here). Dual valve cover bolt pattern is standard. Exhaust port and bolt pattern are raised 3/32" over GM L98 cylinder heads, this rarely affects header or chassis fitment. .
Installation Note: Hydraulic roller cams typically experience valve float at 6200-6400 rpm because of their fast ramp rates. AFR suggest you upgrade your springs to AFR part number 033-8605, 1.270'' O.D. with higher spring pressures and use our Patented ''Hydra Rev Kit'' to reduce chances of valve float associated with rpm 6200 or higher.
