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
BigChief 18 14 424 440cc CNC

Big Chief 18° & 14° 424-440cc 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.

Big Chief heads have dominated in Sportsman through Pro Stock 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 18° or 14° heads to fit your exact engine combination.

Heads are sold individually.


Material: RMR Cast Aluminum Alloy

Valve Angle: 18°/14°

Intake Port Volume: 424/440cc CNC

Intake Valve: 2.400”

Exhaust Valve: 1.900”

Chamber Volume: 87cc

Intake Port Shape: Rectangle

Port Location: Spread port

Big Chief 18° 424cc – Aluminum

18000000 – Bare Program 381 Rect.

18000000S – Solid Bare Program 381 Rect.

18074136 – Full Port Assembly Rect. 424cc 2.400/1.900 1.625D 4.500

18075136 – Full Port Assembly Rect 424cc 2.400/1.900 1.625D 4.600

Big Chief 14° 440cc – Aluminum

18100000 – Bare Program 3815 Rect.

18100000S – Solid Bare Program 3815 Rect.

18174136 – Full Port Assembly Rect. 440cc 2.400/1.900 1.625D 4.500

18175136 – Full Port Assembly Rect. 440cc 2.400/1.900 1.625D 4.500

Call Dart today for questions – 248-362-1188.