1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 407Get this manual
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VALVE GUIDE BOR ES
" lves with oversize stems are 'ailable (see specifications) To ream va lve e:uide bores for .015" (.381mm) ove rsize val ve, use oo J-583 0-2 and for s