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Sierra Part #18-4189
For Mercruiser stern drive engine
Sierra piston kit for Mercruiser stern drive engine. For 330 GM, 330 GM/W.B.W., 340, 454 Magnum GM, 7.4L GM (IB), 7.4L Bravo GM, and 7.4L W/HURTH (IB) models. Sierra Part #18-4189.
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