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Fits:  Sierra 18-3574 Circulating Water Pump GM (Chevy) 7.4-Liter and 8.2-Liter (454 and 502 Big Block V-8 Engines late model with composite timing covers. Bi-directional Brass Impeller, Stainless Steel Backing Plate, Includes Mounting Gaskets. Fits both LH and RH Rotation engines. 1-year limited warranty.
Replaces Mercruiser 850454, 8504541, Mallory 9-42604

Mercury Marine 850454, 850454 1, OMC 3855991, Sierra 18-3574

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