Dart Machinery, LTD. stands behind each product we manufacture 100%. Each component undergoes a detailed manufacturing process that involves the hundreds of calculated and precision steps to ensure the finest quality possible.

Warning This product contains chemicals known to the State of California to cause cancer and reproductive harm. www.P65Warnings.ca.gov
PRO1 15 205cc LS Exhaust

PRO1 15° 225cc LS (LS1 compatible)



PRO1 15° 225cc intake runner covers applications from street cars and trucks to racing. As cast ports flow more than many ported designs at a much more affordable price.

Dart’s 15° 225cc Aluminum cathedral port cylinder head for GM LS series small block V8 engines offers higher performance and more versatility than factory designs.

The Dart LS high performance cylinder head has better airflow, more efficient combustion chambers, and more user friendly features than production LS castings.

The Dart LS style cylinder head retains stock valve angles, stock valve locations and stock accessory mounting holes to make installation easy. Virtually everything else has been improved.

Heads are sold individually.

Material: RMR Cast Aluminum Alloy

Valve Angle: 15° (stock)

Intake Port Volume: 225cc

Intake Valve: 2.050”

Exhaust Valve: 1.600”

Chamber Volume: 62cc

11020020 – Bare Head 2.050/1.600 VJ

11021122 – 1.290” Beehive Springs for Hydraulic Roller 2.050/1.600 .625”

LS1 Pro 1 Head Tech Sheet – H58