You have no items in your shopping cart.
Subtotal
$ 0.00
Our largest and most powerful 60/40 head for the small block Chevy features 100% CNC machined intake runners, exhaust ports and combustion chambers. Capable of flowing 350 CFM at 0.800" of lift these heads come equipped with Titanium retainers and high quality components throughout, the 60/40 valve spacing which requires shaft mounted rocker arms for optimum valve train geometry and extra machining for 3/8" pushrod clearance. NPP stands for "no pushrod pinch."
| 245cc NPP Aluminum SBC Cylinder Heads | |||
|---|---|---|---|
| Part # | Exhaust Port | Porting Finish | Combustion Chamber |
| 1137-TI | Stock | Competition | 70cc |
| 1138-TI | Stock | Competition | 80cc |
| 1139-TI | Spread Port | Competition | 70cc |
| 1140-TI | Spread Port | Competition | 80cc |
Click part # to add product to your cart
| 245cc Race Head Flow Chart | |||||||||
| .200 | .300 | .400 | .500 | .550 | .600 | .650 | .700 | .800 | |
| Int | 161 | 224 | 271 | 305 | 320 | 330 | 336 | 341 | 345 |
| Exh | 128 | 181 | 214 | 235 | 242 | 247 | 251 | 254 | 256 |
Test conducted at 28" of water (pressure) on Superflow 600
Bore Size: 4.155", 3/4" radius plate exhaust, 1 7/8" curved pipe
| 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, 2.125" x 5.000" Overall Valve Length | AFR7253 |
| 8mm Bead Lock Exhaust Valve, 1.600" x 5.030" Overall Valve Length | AFR7254 |
| PAC Racing Springs 1.550" OD Solid Roller Dual Valve Spring Pac #1225, 250 lbs on seat, .800" maximum lift, Max RPM 8000-8200 | AFR8001 |
| 10° Titanium Retainers 1.490" O.D x 1.115" I.D x .745" I.D | AFR8505 |
| 10° Bead Lock Valve Keepers with lashcap recess | AFR9009 |
| Viton Valve Seals .600" O.D x .495" I.D | AFR6612 |
| Hardened Valve Spring I.D Locator 1.550" O.D x .780" I.D | AFR8048 |
| Ductile Iron Intake Valve Seats 2.200" O.D x 1.750" I.D x.375" Deep | AFR9060 |
| Ductile Iron Exhaust Valve Seats 1.696" O.D x 1.325" I.D x .305" Deep | AFR9070 |
| 8mm Bronze Valve Guides .502" O.D x 2.100" O.A.L | AFR9051 |
| Specifications & Features: | |
| Material | A356 Aluminum |
| Intake Port Volume | 245cc |
| Intake Port Dimension | 2.200" H x 1.300" W 7/16 Radius |
| Intake Port Location | Stock |
| Exhaust Port Volume | 80cc |
| Exhaust Port Dimension | 1.465" H x 1.570" W |
| Exhaust Port Location | .250" Raised |
| Combustion Chamber Size | 70cc or 80cc |
| 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 65cc Maximum |
| Angle Mill | .009" per cc 60cc Maximum |
| Note: Angle mills might require .120" Thick intake gasket. | |
| Minimum Cross Sectional Area | 2.730 sq. in. |
| Spark Plug Dimensions | 14mm x .750" w/Gasket Seat |
| Carb EO# | Non Emissions Compliant |
| Categories | Engine Components |
|---|---|
| Manufacturer Part Number | 1137-TI |
| Brand | Air Flow Research |
| Part Type | Cylinder Heads |
| Vehicle Make | Chevrolet |
| Engine Type | Small Block |
Similar Products
