AFR 235cc Competition Eliminator SBC Bare Cylinder Heads, Spread Port, 80cc Chambers, No Parts

Spread port heads have the center exhaust ports spread apart approximately 1/2" over stock GM heads. The reason for spread port heads is to achieve additional cooling in the center of the head where the heat concentration is greatest. As standard headers do not fit, spread port headers are required since the center ports are spread further apart than stock GM products. The increased spacing on the exhaust port also requires the use of exhaust gasket Fel-Pro #1409. Spread port heads only come with a Stahl bolt pattern. AFR's spread port head has all the benefits and features of AFR's standard head. As all benefits and features are the same, please review respective page for product details (i.e. for 210cc spread port view 210cc SBC "Eliminator").

Note: Head comes completely bare, no parts.

*Notice Pictures are for reference heads would come bare, no parts.

The Mid-Sized 60/40 Powerhouse with Spread Ports! - Information below is referring to fully assembled 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. Drilling for centerbolt valve covers available as an option.
The exhaust ports are raised .250" over a standard GM L-98 cylinder head.

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

Note:
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

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	Stock
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	.750"
Minimum Bore Diameter	4.000"
Flat Mill	.006" per cc 60cc Maximum
Angle Mill	.009" per cc 55cc Maximum
Minimum Cross Sectional Area	2.470 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 #1409	Fel-Pro #1409
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.