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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PRO1 24 345cc Port

PRO1 24° 345cc

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Maximum street or marine performance, bracket racing, heads up and super classes. Over 7,000 RPM, 540+ cubic inches.

The PRO1 24° 345cc cylinder head is for uncompromising performance and racing applications which favor high RPM power over low end flexibility. Best for big cubic inch, high RPM use.

Rolled valve angles, improved spark plug location, extra long intake valves, raised exhaust ports, and fast burn chambers. Works with off the shelf pistons, valve train components, and intake manifolds.

Long wearing Bronze valve guides, screw-in studs, multi-angle intake seats with hardened, radiused exhaust seats are standard.

Assemblies include Stainless Steel valves, premium springs, locks, retainers, guide plates and seals.

Heads are sold individually.


Material: RMR Cast Aluminum Alloy

Valve Angle: 24°

Intake Port Volume: 345cc

Intake Valve: 2.300”

Exhaust Valve: 1.880”

Chamber Volume: 121cc

Intake Port Shape: Rectangle

Exhaust Port Location: .300” raised

PRO1 24° 345cc – Aluminum

19300030 – Bare Head

19300132 – 1.550” Dual Springs for Solid Roller .690”

19300136 – 1.625” Dual Springs for Solid Roller Cam .850”

PRO1 24° 345cc – Aluminum (Marine Heads)

19300030M – Bare Head

19300132M – 1.550” Dual Springs for Hydraulic Roller Cam .690”

PRO1 310, 325 & 345 Tech Sheet – H38