1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 468Get this manual
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w ise to the head)' iII cau se di rec moveme nt indicato stem Indi ca tor tem must con tac ide of valve stem iust above valve guideWit valve head dropped aboul16" (l .6 mm) off va lve seatmove valve s