The Sierra 18-3574 Circulating Water Pump replaces Mercruiser 8M0113735 for applicable GM Big Block Mercruiser engines. This is an engine coolant/circulation pump that moves cooling water through the engine's internal cooling passages; it is not a raw-water pickup pump.
Fits late-model GM Big Block engines with composite timing cover, including 454 and 502 CID applications.
Need help with fitment? Contact us with your engine model and serial number and we'll help check suitability.
What is Sierra 18-3574?
Sierra 18-3574 is an aftermarket engine coolant / circulation pump for Mercruiser GM Big Block applications.
Which part numbers cross-reference Sierra 18-3574?
This listing cross-references Mercruiser 850454, Mercruiser 8M0113735 and Volvo Penta 3855991. See the Cross References & Alternative Products section above for linked alternatives where available.
How can I check whether Sierra 18-3574 fits my Mercruiser GM Big Block application?
Contact us with your engine model and serial number and we'll help check suitability.
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