8BA tooling.

[Tod]

Originally Posted by Bored&Stroked

That is probably true, but only if using the block in a 21 stud application and they are drilled out. In the case of the typical 24 stud usage, the cast bosses would be below the deck, but not used. Therefore, we can "hopefully" bore all the way to 3 7/16 and still have decent cylinder wall thickness. I'd love to go to 3 1/2", but this starts to make head gasket sealing an issue.

Hmmmm . . . maybe I'll think about high quality 3/8" 'step studs' and go to 3 1/2". I'll have to look into that!

Right. I can have a machining program for blocks with 21 studs and one for 24. There are some bosses that will need to be elongated because bosses for the 21 and 24 are pretty close together in a few spots but not close enough to use the same round boss.


Tod