Mercury Mercruiser GM V-8 305 CID / 350 CID Engines Service Manual., Page 200Get this manual
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5.0l305 cid5.7l350 cid ENGINES
aCarbon Remover Brush (J-8089) 5 Thoroughly clean valve guides with valve guide cleaner
aValve Guide Cleaner (J-8101) 6 Inspect cylinder heads