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 1134

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 3-angle Radiused Valve Job
Bead Lock Intake Valve, 2.125" x 100L	AFR #7253
Bead Lock Exhaust Valve, 1.600" x 100L	AFR #7254
1.550" OD Dual Solid Roller Valve Spring w/ dampener,	AFR #8000
225 lbs on seat, .710" maximum lift (upgrades available)	Pacaloy #8001
10° Chrome Moly Retainers	AFR #8511
10° Bead Lock Valve Keepers	AFR #9009
7/16" Rocker Studs	AFR #6405
Guide Plates	AFR #6105
Viton Valve Seals	AFR #6612
Hardened Spring Seat	AFR #8045
Intake Vavle Seats	AFR #9060
Exhaust Vavle Seats	AFR #9070
Bronze Valve Guides	AFR #9051

Specifications, Features, and Optional Supporting Components

Head Torque	65-70 ft. lbs
Rocker Stud Torque	55-60 ft. lbs
Intake Port Gasket, 1.310" X 2.180" w/ 3/8" radius	Fel-Pro #1206, AFR #6820
Exhaust Port Gasket	Fel-Pro #1405, AFR #6835
Head Gasket 350 cid	Fel-Pro #1004, AFR #6801
Head Gasket 400 cid	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 Only	AFR #6208
Spark Plug Starting Range	Autolite 3910
Combustion Chambers	70cc or 80cc
Spring Pocket	Can be cut to 1.680, no deeper
Valve Spacing	60 / 40
Rocker Arms	Shaft Mount Recommended
Valve Angle	23°
Angle Mill (Milling options available)	.008" per cc
Flat Mill (Milling options available)	.006" per cc

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.