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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.
PRO1 525 MMR 310 325 345cc

PRO1 24° 525 MMR

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Description

Mercury Racing 525 replacement style heads. Three intake runner sizes offer potential for increased levels of performance.

We’ve retooled Dart’s PRO1 BBC castings to produce a true bolt on upgrade for the Mercury Racing 525 engine. The PRO1 24° 525 MMR is available with 310cc, 325cc or 345cc intake runners and has the correct exhaust bolt pattern for the factory manifolds. A grey chromate surface treatment inhibits salt corrosion for marine usage.

Assemblies can be special ordered with Inconel exhaust valves for forced induction applications.

Heads are sold individually.

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Material: RMR Cast Aluminum Alloy

Valve Angle: 24° 

Intake Port Volume: 310/325/345cc

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 Merc Style – Aluminum (w/ 2.250” Intake Valve)

19100010MMR – Bare Head

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


PRO1 24° 325cc Merc Style – Aluminum (w/ 2.250” Intake Valve)

19200010MMR – Bare Head

19200112MMR – 1.550” Dual Springs for Hydraulic Roller Cam .690”


PRO1 24° 325cc Merc Style – Aluminum (w/ 2.300” Intake Valve)

19200030MMR – Bare Head

19200132MMR – 1.550” Dual Springs for Hydraulic Roller Cam .690”


PRO1 24° 345cc Merc Style – Aluminum (w/ 2.300” Intake Valve)

19300030MMR – Bare Head

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

PRO1 310, 325 & 345 Tech Sheet – H38

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