Afr 227cc Lt4 Eliminator Sbc Aluminum Cylinder Heads

AFR's LT1/LT4 heads are designed for the Gen II reverse cooled SBC engine from 1992-1996. They feature all the same benefits and quality components as AFR's Gen I SBC Heads in addition to dual pattern valve cover mounting holes and Steel Retainers as standard equipment. Not compatible with self-aligning rocker arms. Component upgrade and machining options are available to customize AFR Heads to your specific build.
The Most Powerful LT4 AFR Racing Head!
High flowing AFR LT4 227cc intake port angle plug aluminum cylinder heads are available in two stages of performance. The Race Ready version features 100% CNC ported intakes while the higher flowing Competition Package features 100% CNC ported intakes with greater detail and higher flowing exhaust ports. Both come with 100% CNC ported 55cc-65cc combustion chambers and 80cc exhaust ports with a 3/4" thick head deck (ideal for nitrous or blower applications). Standard valves are lightweight 8mm 2.100" intake and 1.600" exhaust with AFR's hardened ductile iron interlocking valve seats. The 227 has 60/40 valve spacing and piston valve pockets should be checked. The exceptional flow characteristics and 23 degree valve angle make this the perfect head for 350 to 434 cid engines in drag cars, sprint cars, and late model oval trackers operating from 4500 rpm and up. The 227cc aluminum cylinder heads are available only in standard port exhaust. AFR offset stud girdles are the only special parts required. Some applications require shaft mount rockers or .050 offset rocker arms for durability and reliability of valve train components. Standard rockers can be used but the intake rocker arm will be at a slight angle and the roller tip will not be perfectly centered on the valve tip. Not recommended for street use, unless a shaft mount rocker system is used. Dual valve cover bolt pattern is standard.
The exhaust ports are raised .250" over a standard GM L-98 cylinder head.

Basic Package Components Part # 100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
Competition 5-angle Valve Job
8mm Bead Lock Intake Valve 2.100" x 5.000" O.A.L. AFR #7256 8mm Bead Lock Exhaust Valve 1.600" x 5.030" O.A.L. AFR #7254 1.550" OD Roller Dual Valve Spring w/ dampener, 220 lbs on seat, .710" maximum lift AFR #8000 Manley 10° Steel Retainers 1.500" O.D x 1.120" I.D x .705" I.D AFR #8505 10° Bead Lock Valve Keepers with lashcap recess AFR #9009 ARP 7/16" Rocker Studs AFR #6405 Adjustable 5/16" Guide Plates AFR #6103 Viton Valve Seals .600" O.D x .495" I.D AFR #6612 Hardened Valve Spring I.D Locator 1.550" O.D x .780" I.D AFR #8048 Ductile Iron Intake Valve Seats 2.200" O.D x 1.750" O.D x .375" Deep AFR #9060 Ductile Iron Exhaust Valve Seats 1.696" O.D x 1.325" I.D x .305" Deep AFR #9070 8 mm Bronze Valve Guides .502" O.D x 2.100" O.A.L AFR #9051
Specifications, Features, and Optional Supporting Components Material A356 Aluminum Intake Port Volume 227cc Intake Port Dimension 2.240" H x 1.310" W 3/8 Radius Intake Port Location Stock Exhaust Port Volume 80cc Exhaust Port Dimension 1.430" H x 1.540" W Exhaust Port Location .250" Raised Combustion Chamber Size 55cc or 65cc Valve Cover Bolt Pattern  Perimeter Bolt Valve Angle 23° Valve Spring Pocket Diameter 1.580" O.D Max Valve Spring Pocket Machining 1.680" O.D Deck Thickness .750" Minimum Bore Diameter 4.000"  Flat Mill .006" per cc 60cc Maximum Angle Mill .009" per cc 55cc Maximum Minimum Cross Sectional Area 2.340 sq. in. Spark Plug Dimensions 14mm x .750" w/Gasket Seat Carb EO# Not Emissions Complient Intake Port Gasket AFR #6860
Exhaust Port Gasket, Fel-Pro #1405 AFR #6835
Head Gasket, 350cid Fel-Pro #1074 AFR #6803 SB Chevy Head Bolt Kit, ARP #134-3701 AFR #6310 SB Chevy Head Stud Kit, 12 Point Nuts, ARP #234-4301 AFR #6305
Head Bolt Washers, Manley  AFR #6320 Stud Girdle GM L98  AFR #6200 Suggested Manifold GM LT4 or Edelbrock LT4 Spark Plug Starting Range Autolite 3922  Important: Do not port match you intake manifold to any Fel-Pro gasket as it does not precisely match AFR heads.
Note: Milling head deck will affect flow numbers. Angle mills might require .120" Thick intake gasket.