Re: New block
There may be some slight differences on location for the two bolts on each end of the deck but the bottom of the deck is where the real difference lies between 21 and 24 stud motors. If the deck were made thicker down there all the way along the bottom it might be doable to make some interchangeability between the two types. The 21 has five holes down there and the 24 has 8 so maybe...? It might make the deck a bit stonger too.
If a half bell casting was made for the back that could simulate the early style blocks better and use the early type oil pan, an 8BA type could possibly be adapted killing two birds with one stone. Just about everything else could be worked around one way or another.
All are just thoughts but maybe worth kicking it around.
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