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I won't get into a protracted discussion about why but the casting number you list for the block is very curious. Have you got a photo of it and the date code? The cross bolting on the Marine blocks was hit and miss. They were generally low rpm (under 3500) 300 hp units and had none of the stresses induced by traction. Boat props turn and the boat moves. If the prop is turning faster than the boat cavitation occurs, and the prop moves faster than the water around it, with little or no added load.
Marine engines were numbered C6JE-B and C7JE-A. this is not to be confused with speed boat engines which were generally taken from cars or were service blocks.
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michael
A man that is young in years, may be old in hours, if he have lost no time. But that happeneth rarely. Generally, youth is like the first cogitations, not so wise as the second. For there is a youth in thoughts, as well as in ages... Sir Francis Bacon (1561-1626)
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