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
Race Series 15 284 CNC

Race Series 15° 284cc CNC



Maximum competition, comp/modified drag racing, circle track. Over 7,000 RPM, high compression – low dome.

Dart Race Series 15° 284cc small block heads deliver awesome performance. The shallow valve angle, reshaped raised intake ports and optimized combustion chambers produce a significant increase in both airflow and combustion efficiency.

It is recommended that you contact a Dart technical representative before placing an order for this item. Detailed information about your planned engine build will help to ensure that you choose the right configuration for your motor and that any special parts and considerations are taken into account.

Heads are sold individually.


Material: RMR Cast Aluminum Alloy

Valve Angle: 15°

Intake Port Volume: 284cc CNC

Intake Valve: 2.150”/2.180”

Exhaust Valve: .600”/1.625”

Chamber Volume: 48cc w/Ti

Plug Type: Angle

Race Series 15° 284cc CNC – Aluminum

14300000C – Bare Head – No Porting

Full Port CNC – 2.15/1.600 Valves

14372010 – Bare Head – Super Mod Port

14372111 – 1.550” Dual Springs for Solid Roller Cam .750”

Full Port CNC – 2.18/1.600 Valves

14372030 – Bare Head – Full Port

14372131 – 1.550” Dual Springs for Solid Roller Cam .750”

Full Port CNC – 2.18/1.625 Valves

14372040 – Bare Head – Full Port

14372141 – 1.550” Dual Springs for Solid Roller Cam .750”

RACE 15º Tech Sheet – H24