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
RaceSeries 18 250 272cc CNC Port

Race Series 18° 250–272cc CNC



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. We’ve refined the 18° design to give our customers more versatility, more performance, more reliability, and higher quality.

Assemblies include Stainless Steel valves, premium springs, locks, retainers and seals. Titanium valves are an available option.

Heads are sold individually.


Material: RMR Cast Aluminum Alloy

Valve Angle: 18°

Intake Port Volume: 250-272cc CNC

Intake Valve: 2.150”/2.180”

Exhaust Valve: 1.600”

Chamber Volume: 66cc w/SS

Plug Type: Angle

RACE SERIES 18° 250–272cc CNC – Aluminum

14100000C – Bare Head – No Porting

Full Port CNC Std. – 250cc – 2.150/1.600 Valves

14172010 – Bare Head – Full Port

14172111 – 1.550” Dual Springs for Solid Roller Cam .750”

Full Port CNC Std. – 250cc – 2.180/1.600 Valves

14172030 – Bare Head – Full Port

14172131 – 1.550” Dual Springs for Solid Roller Cam .750”

Full Port CNC Lg. – 272cc – 2.180/1.600 Valves

14182030 – Bare Head – Full Port

14182131 – 1.550” Dual Springs for Solid Roller Cam .750”

RACE 18º Tech Sheet – H22