394 casting #'s ???

[kustom60dynamic_rick]

I just picked up a 394 olds, I've been trying to "de-code" the motor but all the info I am finding doesn't quite match.
the casting # on the "bellhousing" is 577476 - 4 1/8
the stamped # on the drivers side of the block at the center exhaust port is G148493
it has a cast iron 4bbl intake # 580677
the motor was pulled from a 60's speed boat, and will be a donor for my 60 olds dynamic 88.
If anyone knows the proper "de-code" for this motor, it would be greatly appreciated. Thanks

[kustom60dynamic_rick]

574534 59-64
577476 61-62
578135 59-60
582813 61-62
582831 59-64
585786 63-64

ALL 394 CU. IN.

Some of this info looks bad to me. But some good. Did this come from the online Olds FAQ? Their info is riddled with bad info on the early rockets.

582813 should be '62 only, and not '61 or any other year.

NONE of those casting numbers should be '59-64! They should be '59-60 371, '59-60 394, '61 394, '62 394, and '63-4 394. The blocks are too different from each other to have the same casting number for all years '59-64.

As for the original question, on the top of the bellhousing, a 394 will have "4-1/8" cast on to indicate the bore size of a 394

this helped me, hopefully it will help someone else as well!