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Dart Machinery Big Chief Pro-1 Aluminum Chev BB Head
These 18 degree heads have what it takes to win, spread intake ports, shallow valve angles, efficient combustion chambers, raised exhaust runners, and a valvetrain that's reliable at high rpm. Huge 421cc intake runners maximize flow. These heads have as cast runners with CNC machined chambers and CNC blended bowls.
Note: Must use specific pistons, intake, and shaft rockers.
Assemblies include 2.400"/1.900" stainless steel valves, 1.625" Vasco Jet springs, titanium retainers, and are ready to install.
Part Type: Cylinder Head
Application: Chevrolet Big Block
Cylinder Head Material: Aluminum
Bare or Assembled: Bare
Combustion Chamber Size: 100cc
CNC Machined Combustion Chambers: Yes
Intake Valve Angle: 18
Exhaust Valve Angle: 9
Intake Port Volume: 424cc
CNC Machined Intake Port: No
Intake Port Flow: 455cfm @ .900" Lift/ 28"
Intake Port Location: Standard
Intake Port Shape: Rectangular
Intake Port Dimensions: 1.890" x 2.530"
Suggested Intake Gaskets: Fel-Pro 1298 or Equivalent
Exhaust Port Volume: 185cc
CNC Machined Exhaust Port: No
Exhaust Port Flow: 325 cfm @ .900" Lift/ 28"
Exhaust Port Location: Raised .900"
Exhaust Port Shape: Square
Exhaust Port Dimensions: 2.100" x 1.800"
Suggested Exhaust Gaskets: Fel-Pro 1490 or Equivalent
Suggested Spark Plug: .750" reach
Valve Guides: Manganese Bronze
Valve Guide Spacing: Widened for use on min. 4.500" bore
Valve Stem Diameter: 11/32" (.3415")
Valve Seats: Ductile Iron
Valve Job: Multi-Angle
Intake Valve Diameter: 2.400"
Intake Valve Included: Yes
Exhaust Valve Diameter: Yes
Suggested Valve Length: Intake: 6.600", Exhaust: 6.380"
Valve Spring Pockets: 1.740" O.D. (.030" deeper MAX.)
Valve Springs Included: Yes, 1.625"
Valve Spring Application: 275lbs. Seat, .850" max lift
Valve Springs Retainers Included: Yes (Titanium)
Valve Locks Included: Yes (10 degree)
Valve Seals Included: Yes
Rocker Studs Included: Yes
Guide Plates Included: Yes
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:
Intake Bolt Torque with Oil: 35 ft./lbs.
Manufacturer: Dart Machinery
Manufacturer's Part Number: 18474136
Weight:
Warranty: Race Application, No warranty expressed or implied
Quantity: Sold as Each
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