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Knock Sensor for Mercruiser, Volvo Penta & OMC Inboard Engines: MCM/MIE GM V-8 (454, 502, 540 & 572 CID) Engines.Knock Sensor for Mercruiser, Volvo Penta, and OMC inboard engines: MCM/MIE GM V-8 (454, 502, 540 & 572 CID) Engines.Engine...