1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 507Get this manual

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3 Broken or rocker arm studs 'i th dama!l:ed threads rna' be rep laced with standa rd sluds '
Figure 12 Refaci Valve Seat

5F ini hed valve seat shou ld conta ct approximate center o

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