Originally Posted by Plaka
And the big cc cranks and cams fit? Gee, I may rework my /5 block...
Nope. There is a limit to which crank can go in which block. I don't know the story but it involves specifically early blocks and early cranks. Swapping is limited by the fact you can't get just any crank to fit just any block.
Maybe somebody who knows will elaborate? Or it might be on Anton's Web Pages? Or even Snowbum's if you get lucky?
But swapping cranks is not the issue for using late model cylinders on a /5 block. The issue is the size of the spigot. 1969-1975 uses a 97mm spigot. 1976-1996 uses a 99mm spigot. The change happens during the /6 production years. 1976 /6 blocks use the larger spigot.
In some applications the spigots have to be further clearance ground so the rotating crank misses the edge of the spigot. This applies to the larger /5 cranks I think.