AFR 227cc SBC LT "Eliminator" Racing Cylinder Head

Timeless Design - The first in our line of 60/40 Valve Spacing

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 to 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). Requires shaft mount rockers or .050 offset rocker arms for durability and reliability of valve train components. With the .050 offset the intake rocker arm will be at a slight angle and the roller tip will not be perfectly parallel or centered on the valve tip. Not recommended for street use, unless shaft mount rocker is used. The exhaust port and bolt pattern are raised .250 over GM L-98 cylinder head, this rarely affects header or chassis fitment.

227cc SBC Aluminum Cylinder Head Race Ready Flow Chart

Tested on 4.125 Bore

227cc SBC Race Ready Cylinder Head Flow Chart

227cc SBC Aluminum Cylinder Head Comp. Flow Chart

Tested on 4.125 Bore

227cc SBC Competition 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 #7256 Bead Lock Intake Valve, 2.100" x 5.006" Overall Valve Length
AFR #7254 Bead Lock Exhaust Valve, 1.600" x 5.024" Overall Valve Length
AFR #8000 PAC Racing Spring 1.550" OD Solid Roller Dual Valve Spring, 225 lbs on seat, .710" maximum lift, Max RPM 7200-7400
AFR #8511 Manley 10° 4140 Chrome Moly Retainers
AFR #9009 10° Bead Lock Valve Keepers
AFR #6405 ARP 7/16" Rocker Studs
AFR #6103 Adjustable 5/16" Guide Plates
AFR #6612 Viton Valve Seals
AFR #8048 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 w/ Moly Lube
55 ft. lbs Rocker Stud Torque
AFR #6860 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
55cc to 65cc Combustion Chambers
Can be cut to 1.680, no deeper Spring Pocket
Standard GM L98 Valve Spacing
Standard GM L98 Rocker Arms - T&D .450 Offset
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.

 Model      Product Name   Price   Buy Now 
 1076   AFR SBC 227cc LT4 Race Ready Reverse Cool Heads, (Specify chamber size 55cc - 65cc), complete w/parts   AFR SBC 227cc LT4 Race Ready Reverse Cool Heads, (Specify chamber size 55cc - 65cc), complete w/parts   $2,160.00  Buy Now 
 1126   SBC 227cc Competition Package LT4 Reverse Cool Heads, (Specify chamber size 55cc - 65cc), complete w/parts   SBC 227cc Competition Package LT4 Reverse Cool Heads, (Specify chamber size 55cc - 65cc), complete w/parts   $2,674.00  Buy Now 
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Air Flow Research | 28611 W. Industry Drive | Valencia, CA 91355 | 661-257-8124

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