SBC 227cc Competition Package LT4 Reverse Cool Heads, complete w/parts 

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AFR 227cc SBC LT Eliminator Racing Cylinder Head

The Baddest 23°Standard Port Head

PLEASE SPECIFY COMBUSTION CHAMBER SIZE WHEN ORDERING 55cc-65cc

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High flowing AFR 227cc intake port small block Chevy 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 version features 100% CNC ported intakes with greater detail. Both come with 100% CNC ported 55cc or 65cc combustion chambers and 80cc exhaust ports with a 3/4” thick head deck (ideal for nitrous or blower applications). In addition we also offer the “as cast” Stage 1 heads for 227cc performance on a budget. 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° 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 cylinder heads are available in either standard or spread port exhaust. AFR offset stud girdles are the only special parts required (see footnotes here). 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 shaft mount rocker is used. The Exhaust port is raised .250 over GM L-98 cylinder head.

227cc SBC Aluminum Cylinder Head Race Ready Flow Chart

227cc SBC Aluminum Cylinder Head Comp. Flow Chart

Basic Package Components 100% CNC Ported Combustion Chambers 100% CNC Ported Exhaust Ports 100% CNC Ported Intake Ports 3-angle Radiused Valve Job AFR #7256 Bead Lock Intake Valve, 2.080" x .100" long AFR #7254 Bead LockExhaust Valve, 1.600" x .100" long AFR #8000 1.550" OD Roller Dual Valve Spring, 225 lbs on seat, .710" maximum lift AFR #8511 10° 4140 Chrome Moly Retainers AFR #9009 10° Bead Lock Valve Keepers AFR #6405 7/16" Rocker Studs AFR #6105 Guide Plates AFR #6612 Viton Valve Seals AFR #8045 Hardened Spring Seat 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 55-60 ft. lbs Rocker Stud Torque GM LT4 Intake Gasket Important:Do not port match your intake manifold to GM LT4 Gaskets as it does not precisely fit AFR heads. Don't use GM #12367777. AFR #6835 Exhaust Port Gasket, Fel-Pro #1405 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 #6208 Stud Girdle AFR Offset GM LT4 Suggested Manifold Autolite 3910 Spark Plug Starting Range 65cc or 75cc Combustion Chambers Can be cut to 1.680, 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)

Note: Milling head deck will affect flow numbers.