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AFR 227cc SBC LT4 Aluminum Cylinder Heads
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The Baddest 23º 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.
Note:
These 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.
FREE Shipping on ALL AFR Heads!!!
All AFR Chevy LT1/LT4 Heads not "In Stock" are made to order (12 WEEK BUILD TIME) and are ordered after payment is received. Contact us to see if the heads you want are in stock.
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| Kit Description |
Part Number |
Price |
Buy |
| 227cc LT4 CNC Ported w/parts L98 Angle Plug 58cc-76cc |
1076 |
$2009 |
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| 227cc LT4 Competition Package w/parts L98 Angle Plug 58cc-76cc |
1126 |
$2575 |
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| 227cc LT4 BARE HEADS NO PARTS L98 Angle Plug 70cc |
1196 |
$1009 |
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Intake Ports:
Flow Charts:
Combustion Chamber:
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Exhaust Ports:
Basic Package Components:
100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
70% to 100% CNC Ported Intake Ports
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
10º Titanium Retainers, AFR #8505
10º 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:
Head Torque 65-70 Ft. Lbs.
Rocker Stud Torque 55-60 Ft. Lbs.
Intake Port Gasket, GM LT-4
Exhaust Port Gasket Fel Pro #1406, AFR #6835
Important: Do not port match your intake manifold to this Fel-Pro gasket, as they do not exactly fit AFR heads.
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 23º
Angle Mill (milling available) .008” per cc
Flat Mill (milling available) .006” per cc
Pushrods 5/16” Hardened, AFR #6601 thru #6604
Note: Milling head deck will affect flow numbers
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View the rest of our catalog:
Full Catalog
Please contact us with any questions:
2587 Dos Lomas
Fallbrook, Ca 92028
(760) 586-5617
Email: sales@TREperformance.com
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