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AFR 227cc Competition Eliminator SBC Cylinder Heads, 75cc Chambers

AFR 1120
AFR's 227cc "Race Ready" and "Competition" heads feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings and high quality components throughout. This head features 60/40 valve spacing and requires shaft mount rocker arms for optimum valve train geometry (can be used with .050 offset intake rockers for drag race only applications). Component upgrade and machining options are available to customize AFR Heads to your specific build.
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Description

Timeless Design - The original AFR 60/40 Valve Spacing Head!
High flowing AFR 227cc intake port small block Chevy angle plug aluminum cylinder heads are available in three 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. Both come with 100% CNC ported 65cc or 75cc combustion chambers and 80cc exhaust ports with a 3/4" thick head deck (ideal for nitrous or blower applications). In addition AFR also offers 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 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 in either standard or spread 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. Drilling for centerbolt valve covers available as an option. The exhaust ports are raised .250" over a standard GM L-98 cylinder head.

Note:
2.100 valves will require aftermarket pistons notched for valve clearance.

Basic Package Components Part #
100% CNC 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" Overall Valve Length AFR #7256
8mm Bead Lock Exhaust Valve, 1.600" x 5.030" Overall Valve Length AFR #7254
PAC Racing Spring 1.550" OD Solid Roller Dual Valve Spring, 220 lbs on seat, .710" maximum lift, Max RPM 7200-7400 AFR #8000
Manley 10? Steel Retainers 1.500" O.D x 1.120" I.D x .705" I.D AFR #8511
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 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" I.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
Bronze Valve Guides AFR #9051

Specifications, Features, and Optional Supporting Components
Head Material

A356 Aluminum

Intake Port Volume 227cc
Intake Port Dimension 2.200" H x 1.290" W 5/16 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 65cc or 75cc
Valve Cover Bolt Pattern
Perimeter Bolt
Valve Angle 23?
Valve Spring Pocket Diameter 1.580" O.D
Max Valve Spring Pocket Machining

1.680" O.D

Deck Thickness
.750"
Minimum Bore Diameter 4.000"
Flat Mill .006" per cc 60cc Maximum
Angle Mill .009" per cc 55cc Maximum
Minimum Cross Sectional Area
2.340 sq. in.
Note:Angle mills might require a .120" Thick intake gasket.
Spark Plug Dimensions 14mm x .750" w/Gasket Seat
Carb EO#
Non Emissions Compliant
Shaft Mount Rocker Arms, T&D .450" off-set AFR #6055
Stud Mount Rocker Arms, Hardland Sharp .050 offset AFR #6036
Stud Mount Rocker Arms, Hardland Sharp .050 offset AFR #6035
Intake Gasket 1.280x2.090 w/ 3/8" radius, Fel-Pro #1206 AFR #6820
Exhaust Port Gasket, Fel-Pro #1405 AFR #6835
Head Gasket, 350cid Fel-Pro #1003 AFR #6800
Head Gasket, 400cid Fel-Pro #1014 AFR #6802
SB Chevy Head Bolt Kit, ARP #134-3701 AFR #6310
SB Chevy Head Stud Kit, 12 Point Nuts, ARP #234-4301 AFR #6305
Head Bolt Washers, Manley AFR #6320
Stud Girdle AFR Offset AFR #6208
Suggested Manifold AFR Titan TXR #4801
Suggested Manifold AFR  Titan TXS #4802
Spark Plug Starting Range Autolite 3922
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.

Details

Shipping Information

  • Item Requires Shipping
  • 65.0 lbs.
  • W12.0000” x H12.0000” x L24.0000”
  • Free Basic Shipping
  • This item ships in its own box.
  • FREE continental USA ground shipping on ALL AFR Cylinder Heads

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