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Mercruiser 863903A03 V8 Big Block 8.1L (496 MAG) Heat Exchanger Replacement
Replaces Mercruiser part no. 863903A03
Used on Mercruiser engine:
GM V8 Big Block 8.1L 496 MAG engines.
This heat exchanger has 3.5 inch diameter. For 4 inch diameter see 863903A01
This is a non OEM part MEC 863903A03