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Dart Machinery CNC Ported Pro-1 Aluminum Chev BB Head
Dart Pro-1 CNC heads are professional quality competition cylinder heads. They applied the air flow technology developed in their championship winning Pro Stock engine program to produce these state of the art heads. Every intake port, every exhaust port, every valve bowl and every combustion chamber is 100% CNC machined on special, dedicated Pro-1 castings. Their 5-axis computer controlled machining centers produce compound curves and complex shapes that no human could duplicate with a hand grinder.
Part Type: Cylinder Head
Application: Chevrolet Big Block
Cylinder Head Material: Aluminum
Bare or Assembled: Bare
Combustion Chamber Size: 121cc
CNC Machined Combustion Chambers: Yes
Intake Valve Angle: 24
Exhaust Valve Angle: 15
Intake Port Volume: 355cc
CNC Machined Intake Port: Yes
Intake Port Flow: 415cfm @ .800" Lift/ 28"
Intake Port Location: Standard
Intake Port Shape: Rectangular
Intake Port Dimensions: 1.760" x 2.500"
Suggested Intake Gaskets: Fel-Pro 1275 or Equivalent
Exhaust Port Volume: 138cc
CNC Machined Exhaust Port: Yes
Exhaust Port Flow: 303 cfm @ .800" Lift/ 28"
Exhaust Port Location: Raised .300"
Exhaust Port Shape: Square
Exhaust Port Dimensions: 2.000" x 1.740"
Suggested Exhaust Gaskets: Fel-Pro 1412 or Equivalent
Suggested Spark Plug: .750" reach
Valve Guides: Yes
Valve Guide Spacing: Exhaust moved .045" away from Intake
Valve Stem Diameter: 11/32" (.3415")
Valve Seats: Yes
Valve Job: Multi-Angle
Intake Valve Diameter: 2.300"
Intake Valve Included: No
Exhaust Valve Diameter: 1.880"
Exhaust Valve Included: No
Suggested Valve Length: Intake: 5.505" (+.250"), Exhaust: 5.435" (stock)
Valve Spring Pockets: 1.740" O.D. (.030" deeper MAX.)
Valve Springs Included: No
Valve Spring Application: NA
Valve Springs Retainers Included: No
Valve Locks Included: No
Valve Seals Included: No
Rocker Studs Included: No
Guide Plates Included: No
Valve Cover Mounting Style: Perimeter bolt
Steam Holes Drilled: No
Heat Crossover: No
Suggested Head Bolts: ARP 135-3603
Suggested Head Studs: ARP 235-4103
Suggested Stud Girdle: Power Products 13602K, Howards Cams 90121, Jomar 1114
Head Bolt Torque with Oil: 70 ft./lbs.
Rocker Stud Torque with Oil: 45 ft./lbs.
Intake Bolt Torque with Oil: 35 ft./lbs.
Manufacturer: Dart Machinery
Manufacturer's Part Number: 19574030
Weight: 29 lbs.
Warranty: Race Application, No warranty expressed or implied
Quantity: Sold as Each
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