4.9in Bore Space DRCE Chevy 12 Degree  Racing Heads

4.9" Bore Space DRCE II Chevy 12 Degree Racing Heads

Starting at
$2225.00 Each

Series P/N: 165-FB (QTY & OPTIONS ADDED TO BASE PRICE AT CHECKOUT)

  • 12° Valve Angle
  • Magnesium/Bronze valve guides reduce stem wear
  • Oval 470cc Intake Ports
  • DRCE II Bolt Pattern, 4.9" Bore Space
  • 54cc As-Cast Combustion Chambers
  • Made in the U.S.A.

The Pro-Filer 4.9" bore space cylinder head is modeled after a DRCE II Pro Stock head.

This cylinder head features As-Cast ports and chambers, Oval Intake Ports, DRCE II bolt pattern, four valley bolts and enough water flow to cool the most aggressive tune up.

We have redesigned the rocker area to take a flat one piece bar to assist in high RPM stability of the valve train.

So when you are ready to spread that bore spacing out a notch this is the head for you.

Series P/N: 165-FB Configuration Options


No Options Available

12 Degree DRCE II Style 4.9 Bore Space Head includes 470cc As Cast Ports and 54cc As-Cast Chambers.

Qty
Starting at
$2255.00 Each

Series P/N: 165-FB (QTY & OPTIONS ADDED TO BASE PRICE AT CHECKOUT)

Details


Series P/N: 165-FB DRCE Head Specifications

Material:Aerospace Specification, A356 Aluminum Alloy (Primary Virgin Ingot)
Valve Angle: 12 Degree valve angle
Intake Port Volume & Shape: 470cc, PRECISION As-Cast Oval
Combustion Chamber: 54cc (As-Cast)
Spring Pocket:Maximum of 1.650 (no deeper)
Valve Diameter:Int: 2.450"-2.525" Exh: 1.800"-1.900"
Valve Length:Custom
Deck Thickness:1/2"
Spark Plugs:Revised location to improve flame travel. Machined for a gasketed 3/4" reach plug NGK R5671A-7 or colder
Rocker System: T & D or Jesel
Valve Seats: Copper Alloy
Valve Guides:Manganese Bronze to assist in extending valve life
Valve Covers:Pro-Filer
Bore Spacing: Standard 4.900"
Milling: .0050 per cc flat milling, .007 per cc angle milling
Engine Size:500+ cid
Application: Drag / Truck Pull

Air Flow Detail #165 DRCE II BBC Head - 470cc Runner

Pro Filer DRCE II Big Block Chevy Heads with 470cc Intake Runner, 2.400" Intake Valve and 1.850" exhaust valve and a 50° Valve Job. Flow data based on Cylinder #1 intake and exhaust port. Flow measured at 28" of depression.

Air Flow Detail #165 - 470cc Runner

LiftIntake CFMExh CFM% Exh/Int
0.200 162 115 71%
0.300 238 165 69%
0.400 304 215 71%
0.500 371 265 71%
0.600 432 301 70%
0.700 482 335 70%
0.800 510 352 69%

Air Flow Chart #165 - 470cc Runner

PN165 DRCE II BBC 470cc Runner Air Flow Chart

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