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AFR 235cc Competition Eliminator SBC Cylinder Heads, 80cc Chambers

AFR 1130
AFR's 235cc "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.
Shipping: FREE continental USA ground shipping on ALL AFR Cylinder Heads
Was: $2,999.99
Sale: $2,175.00
Save: 27%
Save: $824.99

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The Mid-Sized 60/40 Powerhouse!
With the price of big displacement SBC engines fractions of what they were years ago, the allure to go BIG is stronger than ever. To help quench the thirst of that large displacement monster AFR is proud to offer the largest direct bolt on 23° Chevy head yet. At 235cc, anything under 400 cubic inches can look the other way. It has the same geometry of the 227 head and will accept all the same rocker arms, stud girdles, shaft mount systems, etc. AFR offset stud girdles are the only special parts required. Some applications require shaft mount rockers or .050 offset intake rocker arm for durability and reliability of valve train components. Standard rocker arms 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. These brand new heads feature a larger 2.125" diameter intake valve. Exhaust valve diameter stays the same at 1.600" with a little more flow from the larger runner volume. The big news is the all new intake port design which pushes this standard location intake port over 340 CFM’s! That’s 18° territory and this head should be able to generate power figures that rival those other companies 18° heads (725+ HP). This head is not for every large displacement combination so if you are unsure whether this is the right AFR head for you, we always encourage you to contact us directly before purchasing. 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.

ALL AFR 235cc Competition series available, part numbers 1130 1132

2.125 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, 2.125" x 5.00" long AFR #7253
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 235cc
Intake Port Dimension 2.200" H x 1.290" W 5/16 Radius
Intake Port Location
Exhaust Port Volume 80cc
Exhaust Port Dimension 1.430" H x 1.540" W
Exhaust Port Location .250" Raised
Combustion Chamber Size 70cc or 80cc
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
Minimum Bore Diameter 4.000"
Flat Mill .006" per cc 60cc Maximum
Angle Mill .009" per cc 55cc Maximum
Minimum Cross Sectional Area
2.470 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 #1004 AFR #6801
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.


Shipping Information

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

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