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 310cc Port

PRO1 24° 310cc

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For street performance and mild bracket racing. Under 7,000 RPM, under 500 cubic inches. Excellent mid-range torque and power, good for heavier vehicles.

Inspired by Dart’s championship winning Pro Stock designs, the PRO1’s race proven features include rolled valve angles, improved spark plug location, extra long intake valves, raised exhaust ports, and fast burn chambers – yet the PRO1 310cc can be used 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. Best of all, our precision cast ports produce outstanding airflow without time consuming porting.

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: 310cc

Intake Valve: 2.250”/2.300”

Exhaust Valve: 1.880”

Chamber Volume: 121cc

Intake Port Shape: Rectangle

Exhaust Port Location: .300” raised


Dart Marine PRO1 cylinder heads

Features an exclusive chromate surface finish to inhibit corrosion and extend the life of the head.

Fitted with Inconel exhaust valves to withstand the extended running time and temperatures typical of marine usage.

PRO1 24° 310cc – Aluminum (w/ 2.250” Intake Valve)

19100010 – Bare Head

19100111 – 1.550” Single Springs for Hydraulic Flat Tappet Cam .660”

19100112 – 1.550” Dual Springs for Solid Roller .690”

19100116 – 1.625” Dual Springs for Solid Roller Cam .850”

PRO1 24° 310cc – Aluminum (w/ 2.300” Intake Valve)

19100030 – Bare Head

19100132 – 1.550” Dual Springs for Solid Roller .690”

19100136 – 1.625” Dual Springs for Solid Roller Cam .850”

PRO1 24° 310cc – Aluminum (Marine Heads w/ 2.190” Intake Valve)

19100070M – Bare Head

PRO1 24° 310cc – Aluminum (Marine Heads w/ 2.250” Intake Valve)

19100010M – Bare Head

19100112M – 1.550” Dual Springs for Hydraulic Roller Cam .690”

PRO1 24° 310cc – Aluminum (Marine Heads w/ 2.300” Intake Valve)

19100030M – Bare Head

PRO1 310, 325 & 345 Tech Sheet – H38