All American CNC 23 Degree Small Block Chevy Racing Heads

All American X CNC 23° Small Block Chevy Racing Heads

Starting at
$1145.00 Each

Series P/N: 176X (QTY & OPTIONS ADDED TO BASE PRICE AT CHECKOUT)

  • 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.

All American Series by Pro-Filer

Series P/N: 176X Configuration Options


Casting Style
Assembly Options
Add Stainless Valves, Valves Springs, Retainers and Locks

All American 176X Series CNC Machined Heads featuring 68cc CNC'd Chambers, 2.125/1.600 Valve Job, Angle Plug Spark Plug Orientation and 235cc intake runners. Optional Stainless Valves, Springs, Retainers and Keepers Assembled. We also offer optional solid heads (no water passages).

Qty
Starting at
$1145.00 Each

Series P/N: 176X (QTY & OPTIONS ADDED TO BASE PRICE AT CHECKOUT)

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

LiftIntake CFMExh 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

PN176X All American CNC 235cc  Runner Air Flow Chart

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