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Dart Machinery Pro1 18 Degree Aluminum Chevrolet Small Block Heads
Designed for maximum competition, comp/modified drag racing, circle track. Over 7,000 RPM, high compression. By reducing the valve angle, reshaping the raised intake ports, and optimizing the combustion chambers, they produced a significant increase in both airflow and combustion efficiency and that means more power! Dart delivers the features that put you ahead of the competition.
• Cast Aluminum 245cc intake ports (371 cfm @ .750 / 28")
• Full Port CNC Exhaust (261 cfm @ .750 / 28")
• Full Port CNC Chambers
Part Type: Cylinder Head
Application: Chevrolet Small Block
Cylinder Head Material: Aluminum
Bare or Assembled: Bare
Combustion Chamber Size: 65cc
CNC Machined Combustion Chambers: Yes
Intake Valve Angle: 18
Exhaust Valve Angle: 18
Intake Port Volume: 245cc
CNC Machined Intake Port: No
Intake Port Flow: 371 cfm @ .750 lift / 28"
Intake Port Location: Raised 5 Degrees
Intake Port Shape: Rectangular
Intake Port Dimensions: 2.150" x 1.290"
Suggested Intake Gaskets: Fel-Pro 1282 or Equivalent
Exhaust Port Volume: 108cc
CNC Machined Exhaust Port: Yes
Exhaust Port Flow: 261 cfm @ .750 lift / 28"
Exhaust Port Location: Raised and spread port, GM & Stahl spread pattern
Exhaust Port Shape: Stadium Shape
Exhaust Port Dimensions: 1.740" x 1.500"
Suggested Exhaust Gaskets: Dart# 65222000 or Equivalent
Spark Plug Style: Angled
Suggested Spark Plug: .750" reach
Valve Guides: Yes, 1/2" OD Mag. Bronze
Valve Guide Spacing: 1.935"
Valve Stem Diameter: .3415"
Valve Seats: Yes, Ductile Iron
Valve Job: Multi-Angle
Intake Valve Diameter: 2.180"
Intake Valve Included: No
Exhaust Valve Diameter: 1.600"
Exhaust Valve Included: No
Suggested Valve Length: 5.550"
Valve Spring Pockets: 1.550" OD (.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: NA
Suggested Head Studs: Dart# 66110012
Suggested Stud Girdle: NA
Head Bolt Torque with Oil: NA
Rocker Stud Torque with Oil: NA
Intake Bolt Torque with Oil: 35 ft/lb.
Manufacturer: Dart Machinery
Manufacturer's Part Number: 11992030
Weight: 27 lbs.
Warranty: Race Application, No warranty expressed or implied
Quantity: Sold as Each
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