AFR 227cc LT4 SBC Racing Cylinder Head
The Baddest 23°Standard Port Head
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Note:These cylinder heads are specifically design for 1992-95 Corvettes and 1993-97 Camaros LT-1 and LT-4 engines using the GM LT-4 or equivalent manifold. |
High
flowing AFR 227cc intake port small block Chevy angle plug aluminum cylinder
heads are available in two 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 55cc or 65cc combustion chambers and 80cc exhaust ports
with a 3/4” thick cylinder 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 lightweight 8mm 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 cylinder 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 cylinder heads are available in either standard
or spread port exhaust. AFR offset stud girdles are the only special
parts required (227cc SBC Aluminum Cylinder Head Street Flow Chart |
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227cc SBC Aluminum Cylinder Head Comp. Flow Chart |
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227cc SBC Racing Aluminum Cylinder Head Part Numbers
CNC Ported Pairs of Heads Complete With Parts or
Ready to Install
Race Ready CNC Strip Ported Heads |
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Description |
Part Number |
| 227cc Racing Head, LT4, Standard/Reverse Cooled, 55-65cc | 1076 |
Competition Package CNC Ported Heads |
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Description |
Part Number |
| 227cc Racing Head, LT4, Standard/Reverse Cooled, 55-65cc | 1126 |
Stage 1 Bare Heads (no parts or porting) |
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Description |
Part Number |
| 227cc Racing Head, LT4, Standard/Reverse Cooled | 1196 |
Not legal for sale or use on pollution controlled motor vehicles in the United States.
| Basic Package Components | Part # |
| 100% CNC Ported Combustion Chambers 100% CNC Ported Exhaust Ports 100% CNC Ported Intake Ports 3-angle Valve Job |
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| Intake Valve, 2.100" x .100" long | AFR #7256 |
| Exhaust Valve, 1.600" x .100" long | AFR #7254 |
| 1.550" OD Roller dual valve spring w/ dampener, 225lbs on seat, .710" maximum lift (upgrades available) |
AFR #8000 |
| 10° 4140 Chrome Moly Retainers | AFR #8511 |
| 10° Valve Locks | AFR#9009 |
| 7/16" Rocker Studs | AFR #6405 |
| 5/16" Guide Plates | AFR#6105 |
| Valve Seals | AFR #6612 |
| Hardened Shims | AFR #8045 |
| Intake Valve Seats | AFR #9060 |
| Exhaust Valve Seats | AFR#9070 |
| Bronze Valve Guides | AFR#9051 |
Special orders available on request.
| 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 | AFR #6860 |
| Exhaust Port Gasket | Fel-Pro #1405, AFR #6835 |
| Head Gasket | 350cid Fel-Pro #1074, AFR #6803 |
| Head Bolts & Studs | Standard ARP, AFR #6310 & #6305 |
| Head Bolt Washers | Manley, AFR #6320 |
| Stud Girdle AFR offset | AFR #6206 |
| Suggested Manifold | Victor Jr, Super Victor or HV1000 |
| Spark Plug Starting Range | Autolite 3910 |
| Combustion Chambers | 55cc - 65cc |
| Spring Pocket can be cut to 1.750, no deeper | |
| Valve Spacing | 60/40 |
| Rocker Arms | Standard |
| Valve Angle | 23° |
| Angle Mill (milling options available) | .008" per cc |
| Flat Mill (milling options available) | .006" per cc |
| Pushrods | 5/16" Hardened AFR #6601 - #6604 |
Important: Do not port match you intake manifold to Fel-Pro gasket as it does not precisely fit AFR heads.
Note: Milling head deck will affect flow numbers.