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 18 245cc

PRO1 18° 245cc



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. We 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. With the all new PRO1 18° 245cc design we provide our customers the quality, strength and performance you expect from a name like Dart.

Heads are sold individually.


• Cast intake ports with bowl blend.

• Full port exhaust.

• CNC chambers.

• Assemblies include: Stainless Steel valves, premium springs, locks, retainers and seals. Titanium valve options are available.

Material: RMR Cast Aluminum Alloy

Valve Angle: 18°

Intake Port Volume: 245cc

Intake Valve: 2.150″/2.180″

Exhaust Valve: 1.600”/1.625″

CNC Chamber Volume: 66cc

Plug Type: Angle

PRO1 18° 245cc – Aluminum

66cc Combustion Chambers – 2.150”/1.600” Valves

11992010 – Bare Head

11992113 – 1.550” Dual springs for Solid Roller Cam .750”

66cc Combustion Chambers – 2.180”/1.600” Valves

11992030 – Bare Head

11992133 – 1.550” Dual springs for Solid Roller Cam .750”

Pro1 18° Tech Sheet – H66