1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 437Get this manual
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CYLINDER HEAD and VALVE RECONDITIONING
,VO T: xc es sivc valve oS tern GO bore clearance willcause lack of powerrough idling and nois)' alue and may ause 'alve breakageInsufficie nt clearance u: