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Dart 11511122L - Dart LT1/LT4 Pro 1 Aluminum Cylinder Heads

Dart 11511122L - Dart LT1/LT4 Pro 1 Aluminum Cylinder Heads

Dart#301-11511122L

LT1/LT4 Pro 1
  • Assembled
  • Intake Valve: 2.050''
  • Exhaust Valve: 1.600''
  • Dual Valve Springs: 1.437"(130 lbs @ 1.80", .620" max lift)

    Dart 11511122L - Dart LT1/LT4 Pro 1 Aluminum Cylinder Heads Details

    LT1/LT4

  • Intake Ports: 215cc

    Specifications:
  • Valvetrain: Standard SBC 3/8" stud mount or can be modified to 7/16"
  • Intake Port Location: Stock
  • Intake Port Dimensions: 1.190" x 2.075"
  • Intake Flow: 257 cfm @ .500" lift/28"
  • Exhaust Port Location: Stock
  • Exhaust Port Dimensions: 1.410" x 1.350"
  • Exhaust Flow: 172 cfm @ .500" lift/28"
  • Manifold: LT-style
  • Pushrod Length: Stock (should always measure)
  • Pushrod Guide Plate: Not used (uses stock-type self-aligning rockers)
  • Retainers: Steel 7°
  • Stud Girdle: Any standard girdle
  • Valve Length: 4.890"
  • Valve Stem Diameter: .3415", 11/32"
  • Valve Guides: .439" OD Mag-Bronze (.002" press)
  • Valve Guide Length: 2.100"
  • Valve Guide Clearance: .0014" to .002" (using Dart .3415" valve stem)
  • Valve Guide Spacing: Moved .030" from stock
  • Valve Seats: Hardened Ductile Iron, .006" press
  • Valve Seat Dimensions: Intake 2.160" x 1.810" x .350", Exhaust 1.650" x 1.350" x .350"
  • Valve Seat Angles: Intake 32°, 45°, 60°, 70°; Exhaust 37°, 45°, radius

  • Dart 11511122L - Dart LT1/LT4 Pro 1 Aluminum Cylinder Heads

    The Dart LT1/LT4 Pro 1 Aluminum Cylinder Heads have advanced features including five angle intake seats and back cut valves that provide shear points for the fuel to go into suspension as it enters the combustion chamber. The spark plugs are located as close to the top and center of the combustion chambers as possible, shortening the distance that the flame front must travel and producing a more uniform pressure rise in the cylinder. They are offered as either bare castings or fully assembled and accept all early and late model accessory brackets!

    Features:
  • Premium Aluminum: 355-T61 Alloy
  • Bolt on Compatibility: Off the Shelf Pistons & Valve Train
  • Hardened Exhaust Seats: For Unleaded Gasoline
  • Valve Guides: Manganese Bronze
  • Combustion Chambers: 58cc
  • Spark Plugs Location: Angled
  • Intake Valve: 2.020 or 2.050''
  • Exhaust Valve: 1.600''
  • Sold Individually.

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