All American X CNC 23° Small Block Chevy Racing Heads
Series P/N: 176X
- End pads drilled and tapped for accessories
- 235cc CNC Ported Intake Runners
- 68cc CNC Chambers
- Bronze guides for reduced stem wear
- Available with or without water jackets
The Pro-Filer All American CNC ported SBC cylinder head has the same outstanding features as our "As-Cast" SBC heads. But we have raised the performance level with a fully CNC ported 235cc intake runners and CNC'd combustion chamber. This has allowed us to put a 2.125" OD intake valve and over 335cfm of flow.
To get the most out of your high performance SBC this is the head for you.
Details
Series P/N: 176X SBC Head Specifications
| Material: | Aerospace Specification, A356 Aluminum Alloy (Primary Virgin Ingot) |
| Valve Angle: | 23° |
| Bore Spacing: | 4.400" Standard |
| Valve Length: | +200" |
| Intake Port Volume & Shape: | 235cc Rectangle Shape |
| Combustion Chamber: | 68cc with CNC Finish |
| Intake & Exhaust Valve OD: | 2.125"/1.600" |
| Intake Port Flow: | 336cfm with 235cc Port |
| Deck Thickness: | 1/2" |
| Spark Plugs: | Angle Plug Revised location to improve flame travel. .750 Reach, Gasketed (NGK R5671A-7 or colder) |
| Milling: | Angle - .0070" per cc Flat - .0050" per cc |
| Valve Guides: | Manganese Bronze to assist in extending valve life |
| Rocker System: | Improved Solid Rocker Bar for added stability. May use standard or majority of aftermarket. |
| Valve Seats: | Ductile Iron |
| Spring Pocket: | Maximum of 1.650 (no deeper) |
| Engine Size: | 400 + cid / 7500rpm |
| Valve Covers: | Drilled for both, center and rail bolt |
| Application: | Street, Strip, Circle Track, Marine |
Air Flow Detail #176X SBC CNC All American Head - 235cc Runner
Pro Filer Small Block Chevy CNC All American Heads with 235cc Intake Runner, 2.125" Intake Valve and 1.600" exhaust valve. Flow data based on Cylinder #1 intake and exhaust port. Flow measured at 28" of depression.
Air Flow Detail #176X - 235cc Runner
| Lift | Intake CFM | Exh CFM | % Exh/Int |
|---|---|---|---|
| 0.200 | 153 | 110 | 72% |
| 0.300 | 225 | 145 | 64% |
| 0.400 | 280 | 180 | 64% |
| 0.500 | 313 | 206 | 66% |
| 0.600 | 325 | 213 | 66% |
| 0.700 | 335 | 216 | 64% |
| 0.800 | 336 | 218 | 65% |
Air Flow Chart #176X - 235cc Runner
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