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.
Availability: AFR discontinued the LT4 227cc heads, search our website for the AFR LT4 210cc for the largest head they make.
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 #|
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|
Intake Port Volume
|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||
|Valve Spring Pocket Diameter||1.580" O.D|
|Max Valve Spring Pocket Machining||1.680" O.D|
|Minimum Bore Diameter||
|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
|Exhaust Port Gasket, Fel-Pro #1405||AFR #6835
|Head Gasket, 350cid Fel-Pro #1074||
|SB Chevy Head Bolt Kit, ARP #134-3701||
|SB Chevy Head Stud Kit, 12 Point Nuts, ARP #234-4301||AFR #6305
|Head Bolt Washers, Manley||
|Stud Girdle GM L98||
|Suggested Manifold||GM LT4 or Edelbrock LT4|
|Spark Plug Starting Range||
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
- Item Requires Shipping
- 65.0 lbs.
- W12.0000” x H12.0000” x L24.0000”
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- This item ships in its own box.
- TRE Performance Difference
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