TREPerformance

The Baddest 23�Standard Port Head High flowing AFR 227cc intake port small block Chevy angle plug cylinder heads are available in three stages of performance. The Race Ready version features 100% CNC ported intakes while the higher flowing Competition version features 100% CNC ported intakes with greater detail. Both come with 100% CNC ported 76cc combustion chambers and 80cc exhaust ports with a 3/4" thick head deck (ideal for nitrous or blower applications). In addition we also offer the "as cast" Stage 1 heads for 227cc performance on a budget. Standard valves are 2.100 intake and 1.600 exhaust with AFR's hardened ductile iron interlocking valve seats. The 227 has 60/40 valve spacing and piston valve pockets should be checked. The exceptional flow characteristics and 23º valve angle make this the perfect head for 350 to 434 cid engines in drag cars, sprint cars, and late model oval trackers operating from 4500 rpm and up. The 227cc heads are available in either standard or spread port exhaust. AFR offset stud girdles are the only special parts required. Some applications require shaft mount rockers for durability and reliability of valve train components. Not recommended for street use, unless shaft mount rocker is used.

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Basic Package Components:

100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
70% to 100% CNC Ported Intake
Competition 3-angle Valve Job
Intake Valve, 2.100" x .050" long, AFR #7031
Exhaust Valve, 1.600" x .050" long, AFR #7057
1.550" OD Roller Valve Spring, 220 lbs. on seat, .670" maximum lift, AFR #8000
10� 4140 Chrome Moly Retainers, AFR #8510
10� Valve Locks, AFR #9005
7/16" Rocker Studs, AFR #6405
5/16" Guide Plates, AFR #6105
Valve Seals, AFR #6611
Hardened Shims, AFR #8045
Intake Valve Seats, AFR #9060
Exhaust Valve Seats, AFR #9070
Bronze Valve Guides, AFR #9050


All Accessory Holes are Predrilled & Tapped!

Specifications, Features,and Supporting Components:

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 #1406, AFR #6835
Head Gasket 350cid Fel Pro #1003, AFR #6800
400cid Fel Pro #1014, AFR #6802 Head Bolts & Studs Standard ARP, AFR #6310 & #6305 Head Bolt Washers Manley, AFR #6320
Stud Girdle AFR #6206
Suggested Manifold Victor Jr, Super Victor, or HV1000, AFR #5005, #5003, or #5065
Spark Plug Starting Range Autolite 3910
Combustion Chambers 76cc
Spring Pocket can be cut to 1.575, no deeper.
Valve Spacing 60/40
Rocker Arms Standard
Valve Angle 23 degrees
Angle Mill (milling available) .008" per cc
Flat Mill (milling available) .006" per cc
Pushrods 5/16" Hardened, AFR #6601 through #6604



Note: Milling head deck will affect flow numbers