AFR SBC 227/75cc Competition CNC Cylinder heads
SKU: AFR1121-1
$5,751.32
AFR SBC 227/75cc Competition CNC Cylinder heads
Description
AFR’s 227cc “Race Ready” and “Competition” heads feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings and high quality components throughout. This head features 60/40 valve spacing and requires shaft mount rocker arms for optimum valve train geometry (can be used with .050 offset intake rockers for drag race only applications).
| Included Components | |
| 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, – 260* max recommended duration, Max RPM 7200-7400 |
AFR #8000
|
| 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 .600″ O.D x .495″ I.D |
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
|
| 8mm Bronze Valve Guides .502″ O.D x 2.100″ O.A.L |
AFR #9051
|
| 227cc Race Ready™ Flow Chart | ||||||||
| .200 | .300 | .400 | .500 | .550 | .600 | .650 | .700 | |
| Int | 148 | 210 | 261 | 296 | 304 | 312 | 315 | 318 |
| Exh | 116 | 155 | 204 | 220 | 225 | 229 | 233 | 237 |
| 227cc Competition Flow Chart | |||||||||
| .200 | .300 | .400 | .500 | .550 | .600 | .650 | .700 | .750 | |
| Int | 152 | 212 | 260 | 292 | 310 | 316 | 322 | 327 | 329 |
| Exh | 120 | 160 | 214 | 230 | 234 | 238 | 241 | 243 | 245 |
Test conducted at 28″ of water (pressure) on Superflow 1020
Bore Size: 4.155″, intake 3/4″ radius plate exhaust, 1 7/8″ curved pipe
| Specifications & Features: | |
| 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
|
| Warning: Do not machine spring pad any deeper. | |
| Deck Thickness |
.750″
|
| Minimum Bore Diameter |
4.000″
|
| Flat Mill |
.006″ per cc 60cc Maximum
|
| Angle Mill |
.009″ per cc 55cc Maximum
|
| Note: Angle mills might require .120″ Thick intake gasket. | |
| Minimum Cross Sectional Area |
2.340 sq. in.
|
| Spark Plug Dimensions |
14mm x .750″ w/Gasket Seat
|
| CARB Status: THESE PRODUCTS ARE ILLEGAL TO OPERATE ON ANY PUBLIC HIGHWAY. THIS MEANS ANY PUBLIC PAVED OR UNPAVED ROADWAY OR IN A PUBLIC PARK. THESE PRODUCTS ARE ONLY LEGAL IF USED ON A DEDICATED RACING VEHICLE. VIOLATION ARE SUBJECT TO A MAXIMUM PENALTY OF $37,500 PER VIOLATION PER VEHICLE, REVOCATION OF REGISTRATION BY DMV, LOSS OF USE ON PUBLIC RIGHT OF WAYS AND PROOF OF CORRECTION OF THE TAMPERING. | |
| Recommended Components: | |
| 1.5 T&D Shaft Mount w/ .450″ off-set |
AFR #6062
|
| 1.6 T&D Shaft Mount w/ .450″ off-set |
AFR #6063
|
| 1.6 Stud Mount Rocker Arms, Hardland Sharp .050 offset |
AFR #6036
|
| 1.5 Stud Mount Rocker Arms, Hardland Sharp .050 offset |
AFR #6035
|
| Intake Gasket |
AFR #6901
|
| Important: Do not use your AFR gasket as a template to port match your intake manifold as one AFR gasket is used for many AFR runner volumes. | |
| Exhaust Port Gasket |
AFR #6905
|
| 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 #4811
|
| Suggested Manifold |
AFR #4810
|
| Spark Plug Starting Range |
Autolite 3922
|
Additional information
| Part Number | AFR1121-1 |
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