227cc SBC LT "Eliminator" 23° Racing Head
Timeless Design - The first in Our Line with 60/40 Valve Spacing
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 Titanium Retainers as standard equipment. Not compatible with self-aligning rocker arms.
227cc SBC Aluminum Cylinder Head Race Ready Flow Chart
Tested on 4.125 Bore
227cc SBC Aluminum Cylinder Head Comp. Flow Chart
Tested on 4.125 Bore
Included Components
100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
Competition 5-angle Valve Job
AFR #72568mm Bead Lock Intake Valve 2.100" x 5.000" O.A.L.
AFR #72548mm Bead Lock Exhaust Valve 1.600" x 5.030" O.A.L.
AFR #8000PAC Racing Spring 1.550" OD Solid Roller Dual Valve Spring, 220 lbs on seat, .710" maximum lift, Max RPM 7200-7400
AFR #851110° Manley Steel Retainers 1.500" O.D x 1.120" I.D x .705" I.D
AFR #900910° Bead Lock Valve Keepers
AFR #6405ARP 7/16" Rocker Studs
AFR #6103Adjustable 5/16" Guide Plates
AFR #6612Viton Valve Seals .600" O.D x .495" I.D
AFR #8048Hardened Valve Spring I.D Locator 1.550" O.D x .780" I.D
AFR #9060Ductile Iron Intake Valve Seats 2.200" O.D x 1.750" I.D x.375" Deep
AFR #9070Ductile Iron Exhaust Valve Seats 1.696" O.D x 1.325" I.D x .305" Deep
AFR #90518 mm Bronze Valve Guides .502" O.D x 2.100" O.A.L
Specifications & Features:
A356 AluminumMaterial
227ccIntake Port Volume
2.200" H x 1.290" W 5/16 RadiusIntake Port Dimension
StockIntake Port Location
80ccExhaust Port Volume
1.430" H x 1.540" WExhaust Port Dimension
.250" RaisedExhaust Port Location
55 or 65ccCombustion Chamber Size
Perimeter BoltValve Cover Bolt Pattern
23°Valve Angle
1.580" O.DValve Spring Pocket Diameter
1.680" O.DMax Valve Spring Pocket Machining
Warning: Do not machine spring pad any deeper.
.750"Deck Thickness
4.000"Minimum Bore Diameter
.006" per cc 60cc MaximumFlat Mill
.009" per cc 55cc MaximumAngle Mill
2.340 sq. in. Minimum Cross Sectional Area
14mm x .750" w/Gasket SeatSpark Plug Dimensions
Non Emissions CompliantCarb EO#
Note: Angle mills might require .120" Thick intake gasket.
Recommended Components:
AFR #6860Intake Gasket
Important: Do not port match your intake manifold to Fel-Pro gasket as it does not precisely fit AFR heads.
AFR #6835Exhaust Port Gasket, Fel-Pro #1405
AFR #6803Head Gasket, 350cid Fel-Pro #1074
AFR #6310SB Chevy Head Bolt Kit, ARP #134-3701
AFR #6305SB Chevy Head Stud Kit, 12 Point Nuts, ARP #234-4301
AFR #6320Head Bolt Washers, Manley
AFR #6200Stud Girdle GM L98
GM LT4 or Edelbrock LT4Suggested Manifold
Autolite 3922Spark Plug Starting Range