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Water Circulating Pump replaces MerCruiser part # 850454-1
Fits Both Tin and Aluminum Timing Chain Cover. Chevy V8 Big Block. 409 CID-6.6 LITRE, 427 CID-6.9 LITRE, 454 CID-7.4 LITRE, 502 CID-8.2 LITRE