AFR 235cc Competition Eliminator SBC Cylinder Heads, 80cc Chambers
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
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 #|
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|
|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
|Valve Spring Pocket Diameter||1.580" O.D|
|Max Valve Spring Pocket Machining||
|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|
|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
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.
- 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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