Built for serious LS horsepower, the Dart Pro1 280cc 15° LS Cylinder Head delivers the airflow, durability, and power potential racers demand. Designed for maximum performance on naturally aspirated or boosted LS builds, this head flows big numbers while maintaining excellent velocity and combustion efficiency.
Featuring a 280cc rectangular intake runner, 68cc combustion chamber, and 2.165”/1.600” stainless valve combo, this head supports 700+ HP potential in the right combo. The as-cast ports are optimized using Dart’s wet-flow technology, ensuring consistent air/fuel distribution and big mid-range torque.
Each head comes fully assembled with dual valve springs, titanium retainers, manganese bronze guides, and ductile iron seats — ready to bolt on and make power.
Perfect for high-revving street/strip, nitrous, or forced-induction LS builds, the Pro1 LS is the ultimate top-end upgrade for racers who expect nothing less than Dart-level performance.
Features:
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Fits GM LS engines (15° valve angle)
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280cc intake runners / 102cc exhaust runners
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68cc combustion chambers
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2.165” intake / 1.600” exhaust valves
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Hydraulic roller cam compatible, up to .650” lift
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Dual springs w/ titanium retainers
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Assembled and ready to install
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Manganese bronze guides / ductile iron seats
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As-cast finish for strength and consistency
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Designed and machined in the USA
Specs:
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Material: Aluminum
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Chamber Volume: 68cc
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Valve Angle: 15°
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Intake Port Shape: Rectangle
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Valve Spring OD: 1.295”
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Retainer Material: Titanium
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Weight: 32 lbs each
When you’re chasing that next tenth on the time slip, Dart Pro1 LS Heads give you the airflow advantage to get there — precision, reliability, and race-proven power.