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AFR 227cc Competition Eliminator SBC Cylinder Heads, Spread Port, 75cc Chambers
AFR 1125
Spread port heads have the center exhaust ports spread apart approximately 1/2" over stock GM heads. The reason for spread port heads is to achieve additional cooling in the center of the head where the heat concentration is greatest. As standard headers do not fit, spread port headers are required since the center ports are spread further apart than stock GM products. The increased spacing on the exhaust port also requires the use of exhaust gasket Fel-Pro #1409. Spread port heads only come with a Stahl bolt pattern. AFR's spread port head has all the benefits and features of AFR's standard head. As all benefits and features are the same, please review respective page for product details (i.e. for 210cc spread port view 210cc SBC "Eliminator").
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Description
High flowing AFR 227cc intake port small block Chevy angle plug aluminum cylinder heads are available in three stages of performance. The Race Ready version features 100% CNC ported intakes while the higher flowing Competition Package features 100% CNC ported intakes with greater detail. Both come with 100% CNC ported 65cc or 75cc combustion chambers and 80cc exhaust ports with a 3/4" thick head deck (ideal for nitrous or blower applications). In addition AFR also offers 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 23 degree 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 aluminum cylinder 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 or .050 offset rocker arms for durability and reliability of valve train components. Standard rockers 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 tip. Not recommended for street use, unless a shaft mount rocker system is used. Drilling for centerbolt valve covers available as an option. The exhaust ports are raised .250" over a standard GM L-98 cylinder head.
Note:
2.100 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 5-angle Valve Job |
|
| 8mm Bead Lock Intake Valve, 2.100" x 5.000" Overall Valve Length | AFR #7256 |
| 8mm Bead Lock Exhaust Valve, 1.600" x 5.030" Overall Valve Length | AFR #7254 |
| PAC Racing Spring 1.550" OD Solid Roller Dual Valve Spring, 220 lbs on seat, .710" maximum lift, Max RPM 7200-7400 | AFR #8000 |
| Manley 10? Steel Retainers 1.500" O.D x 1.120" I.D x .705" I.D | AFR #8511 |
| 10? Bead Lock Valve Keepers with lashcap recess | AFR #9009 |
| ARP 7/16" Rocker Studs | AFR #6405 |
| Adjustable 5/16" Guide Plates | AFR #6103 |
| Viton Valve Seals | AFR #6612 |
| Hardened Valve Spring I.D Locator 1.550" O.D x .780" I.D | AFR #8048 |
| Ductile Iron Intake Valve Seats 2.200" O.D x 1.750" I.D x .375" Deep | AFR #9060 |
| Ductile Iron Exhaust Valve Seats 1.696" O.D x 1.325" I.D x .305" Deep | AFR #9070 |
| Bronze Valve Guides | AFR #9051 |
| Specifications, Features, and Optional Supporting Components |
| Head Material |
A356 Aluminum |
| Intake Port Volume | 227cc |
| Intake Port Dimension | 2.200" H x 1.290" W 5/16 Radius |
|
Intake Port Location
|
Stock |
| Exhaust Port Volume | 80cc |
| Exhaust Port Dimension | 1.430" H x 1.540" W |
| Exhaust Port Location | .250" Raised |
| Combustion Chamber Size | 65cc or 75cc |
|
Valve Cover Bolt Pattern
|
Perimeter Bolt |
| Valve Angle | 23? |
| Valve Spring Pocket Diameter | 1.580" O.D |
| Max Valve Spring Pocket Machining |
1.680" O.D |
|
Deck Thickness
|
.750" |
| Minimum Bore Diameter | 4.000" |
| Flat Mill | .006" per cc 60cc Maximum |
| Angle Mill | .009" per cc 55cc Maximum |
|
Minimum
Cross
Sectional Area
|
2.340 sq. in. |
| Note:Angle mills might require a .120" Thick intake gasket. | |
| Spark Plug Dimensions | 14mm x .750" w/Gasket Seat |
|
Carb EO#
|
Non Emissions Compliant |
| Shaft Mount Rocker Arms, T&D .450" off-set | AFR #6055 |
| Stud Mount Rocker Arms, Hardland Sharp .050 offset | AFR #6036 |
| Stud Mount Rocker Arms, Hardland Sharp .050 offset | AFR #6035 |
| Intake Gasket 1.280x2.090 w/ 3/8" radius, Fel-Pro #1206 | AFR #6820 |
| Exhaust Port Gasket, Fel-Pro #1409 | Fel-Pro #1409 |
| Head Gasket, 350cid Fel-Pro #1003 | AFR #6800 |
| Head Gasket, 400cid 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 #6208 |
| Suggested Manifold | AFR Titan TXR #4801 |
| Suggested Manifold | AFR
Titan TXS #4802 |
| Spark Plug Starting Range | Autolite 3922 |
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.
Details
- AFR 1125
- AFR 1125
- Air Flow Research
- New
Shipping Information
- Item Requires Shipping
- 65.0 lbs.
- W12.0000” x H12.0000” x L24.0000”
- Free Basic Shipping
- This item ships in its own box.
- FREE continental USA ground shipping on ALL AFR Cylinder Heads
- TRE Performance Difference
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