1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 439Get this manual
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than 32" (.795m m) th ic fter valve he ad is Ie gr inding repla ce va lve 1 If necess ry, dress va ve refa in machine grinding wheel Lo make ure it is mooth nd tru Set ch uck 45 ma rk fo grinding valv