- Engines & Components
- Cylinder Heads
- AFR Small Block Chevy 227cc LT4 Eliminator Race Aluminum Cylinder Heads
Timeless Design - The First in AFR's Line
with 60/40 Valve Spacing
High flowing AFR 227cc intake port LT4 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 58cc combustion chambers and 80cc exhaust ports with a 3/4'' thick head deck (ideal for nitrous or blower applications). Standard valves are lightweight 8mm diameter stem, 2.100'' intake and 1.600'' exhaust with AFR's hardened ductile iron interlocking valve seats.
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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 350-434ci engines in drag cars, sprint cars, and late model oval trackers operating from 4500 rpm and up. If you choose to run stud girdles AFR offset girdles are required. These heads 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 LT4 Eliminator Race Cylinder Head Features:
- 100% CNC Ported Combustion Chambers
- 100% CNC Ported Exhaust Ports
- 100% CNC Ported Intake Ports
- Competition 5-angle Valve Job
- 227cc Intake Ports
- 58cc Combustion Chambers
- 80cc Exhaust Ports
- Bead Lock Intake Valve, 2.100'' x 5.006'' Overall Valve Length
- Bead Lock Exhaust Valve, 1.600'' x 5.024'' Overall Valve Length
- PAC Racing Valve Spring: 1.550'' OD Solid Roller Dual Valve Spring, 225 lbs on seat, .710'' maximum lift, Max RPM 7200-7400
- 10° Manley 4140 Chrome Moly Retainers
- 10° Bead Lock Valve Keepers
- 7/16'' Rocker Studs
- Adjustable 5/16'' Guide Plates
- Viton Valve Seals
- Hardened Spring Cup
- Intake Valve Seats
- Exhaust Valve Seats
- Bronze Valve Guides
