C Style Big Block Ford Cylinder Heads
Series P/N: 205
- Accepts up to 1.650 O.D. Springs
- Bronze valve guides reduce stem wear
- Available with or without water jackets
- 420cc Oval Pro Stock Intake Port Design flows 524 cfm!
- Made in the U.S.A.
Pro-Filer has taken Big Block Fords to a new, power-producing, high. The Pro-Filer C replacement cylinder head features an amazing Pro Stock style intake port that is an oval design and flows over 520 cfm! And since we know you love high RPM, the 'C' replacement has a rigid rocker stand area to provide better stability.
So whether you are at the strip or hooked to a sled your Blue Oval will be putting those ole' bowties on the trailer.
When looking for an intake manifold we suggest using a custom sheet metal intake or a Ford Motorsports Intake.
Details
Series P/N: 205 C Style Big Block Ford Head Specifications
| Material: | Aerospace Specification, A356 Aluminum Alloy (Primary Virgin Ingot) |
| Valve Angle: | Standard Stock C Style |
| Bore Spacing: | 4.900 (standard big block) |
| Intake Port Volume & Shape: | Oval-Shaped, PRECISION As-Cast 420cc |
| Intake Port Location: | Raised .200" from stock location |
| Intake Port Flow: | 524 cfm@ .900 with 2.450 valve |
| Combustion Chamber: | Heart-Shaped As-Cast - 54cc |
| Milling: | .005 per cc flat milling, .007 per cc angle milling |
| Exhaust Port Location: | Raised .200" from stock location |
| Valve Diameter: | Intake - 2.450"-2.480", Exhaust - 1.800"-1.850" |
| Valve Length: | Intake - 6.400" long (2.100 install) , Exhaust - 6.300" long (2.100 Install) |
| Deck Thickness: | 1/2" Deck for Nitrous or Blown Applications |
| Spark Plugs: | Revised location to improve flame travel. Use .750" Reach, Gasketed (NGK R5671A-7 or colder) |
| Rocker System: | Improved Solid Rocker Bar for added stability. Majority of aftermarket, (i.e. T&D and Jesel) |
| Valve Guides: | Manganese Bronze to assist in extending valve life |
| Valve Spring Pocket: | 1.650 OD Maxiumum (no deeper) |
| Valve Seats: | Copper Alloy (standard) |
| Engine Size: | 4.60 bore size and larger |
| Application: | High Performance (i.e. street/strip/marine) |
Parts and Accessories
| Intake Manifold: | Fabricated Sheet Metal |
| Intake Gaskets: | Use Fel-Pro Blank (cut-out) |
| Valve Covers: | Sheet Metal Fabricated |
| Pistons: | Custom |
| Rocker Systems: | Jesel or T&D |
| Head Bolts / Studs: | ARP |
| Bore Size: | Optimized for 4.600 Bore or Larger (no less than 4.550 bore) |
| Rocker Systems: | Shaft Mounted: Jesel or T&D (both available from Pro-Filer) |
| Valves: | VICTORY Valves - Titanium or Stainless Steel (11/32 or 5/16 Valve Stem) |
| *Call our Tech Department for additional recommendations |
Air Flow Detail #205 BBF C Style Head - 420cc Runner
Pro Filer C Style Big Block Ford Heads with 420cc Intake Runner, 2.450" Intake Valve and 1.850" exhaust valve. Flow data based on Cylinder #1 intake and exhaust port. Flow measured at 28" of depression.
Air Flow Detail #205 420cc Runner
| Lift | Intake CFM | Exh CFM | % Exh/Int |
|---|---|---|---|
| 0.200 | 171 | 135 | 79% |
| 0.300 | 255 | 180 | 71% |
| 0.400 | 333 | 218 | 65% |
| 0.500 | 396 | 262 | 66% |
| 0.600 | 483 | 308 | 64% |
| 0.700 | 511 | 322 | 63% |
| 0.800 | 524 | 329 | 63% |
| 0.900 | 525 | 334 | 64% |
Air Flow Chart #205 - 420cc Runner
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