The BEST 23° Standard Port Head Ever Produced!
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 335 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.

ALL AFR 235cc Competition series available, part numbers 1130 1132 1134

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

Basic Package Components:

100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
Competition 3-angle Valve Job
Bead Lock Intake Valve, 2.125" x .100" long, AFR #7253
Bead Lock Exhaust Valve, 1.600" x .100" long, AFR #7254
1.550" OD Roller Valve Spring, 225 lbs. on seat, .710" maximum lift, AFR #8000
10 degree 4140 Chrome Moly Retainers, AFR #8511
10 degree Bead Lock Valve Keepers, AFR #9009
7/16" Rocker Studs, AFR #6405
5/16" Guide Plates, AFR #6105
Viton Valve Seals, AFR #6612
Hardened Spring Seat, AFR #8045
Intake Valve Seats, AFR #9060
Exhaust Valve Seats, AFR #9070
Bronze Valve Guides, AFR #9051

All Accessory Holes are Predrilled & Tapped!

Specifications, Features,and Supporting Components:

Head Torque 65-70 Ft. Lbs.
Rocker Stud Torque 55-60 Ft. Lbs.
Intake Port Gasket, 1.310"x2.180" w/ 3/8" radius, AFR #6820
Important: Do not port match your intake manifold to this Fel-Pro gasket, as they do not exactly fit AFR heads.
Exhaust Port Gasket Fel Pro #1405, AFR #6835
Head Gasket 350cid Fel Pro #1003, AFR #6800
Head Gasket 400cid Fel Pro #1014, AFR #6802
Head Bolts & Studs Standard ARP, AFR #6310 & #6305
Head Bolt Washers Manley, AFR #6320
Stud Girdle AFR #6206 or AFR #6208
Suggested Manifold Victor Jr, Super Victor, or HV1000, AFR #5005, #5003, or #5033
Spark Plug Starting Range Autolite 3910
Combustion Chambers 70cc or 80cc
Spring Pocket can be cut to 1.575, no deeper.
Valve Spacing 60/40
Rocker Arms Standard or Shaft Mount
Valve Angle 23 degrees
Angle Mill 58cc to 65cc (milling available) .008" per cc
Flat Mill up to 65cc (milling available) .006" per cc
Pushrods 5/16" Hardened, AFR #6601 through #6603

Note: Milling head deck will affect flow numbers. Angle mills may require a .120 thick intake gasket.