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.

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BigChief14 433cc CNC

Big Chief 14° 433cc CNC



Maximum Top Sportsman, Top Dragster, Pro Mod and Pro Street competition. Excellent with alcohol and nitrous, over 7,000 RPM, over 500 cubic inches.

An updated Dart Big Chief 385 program incorporates a 2.500” intake valve for a dramatic increase in air flow.

Big Chief heads have dominated in Sportsman classes since their introduction, and we have continued to improve the design with the latest Pro Stock technology.

With our sophisticated CNC machining programs, we can tailor a pair of Big Chief 14° CNC heads to fit your exact engine combination.

Copper seats are standard and assemblies come with Titanium valves.

Heads are sold individually.


Material: RMR Cast Aluminum Alloy

Valve Angle: 14°

Intake Port Volume: 433cc CNC

Intake Valve: 2.470”/2.500”

Exhaust Valve: 1.800”/1.850”

Chamber Volume: 86cc

Intake Port Shape: Oval

Port Location: Spread port

Big Chief 14° 433cc – Aluminum

18200000 – Bare Head No Porting 384

18275070 – Bare Head Full Port 384 433cc 2.470/1.800 4.600

18275179 – Assembly Full Port 384 433cc 2.470/1.800 1.650T 4.600

18300000 – Bare Head No Porting 385

18375080 – Bare Head Full Port 385 433cc 2.500/1.800 4.600

18375189 – Assembly Full Port 385 433cc 2.500/1.800 1.650T 4.600

Big Chief 14º CNC Tech Sheet – H53