400 top on a 250 bottom end

[vmx1963]

I've heard that the 1974 400 engine is virtually the same as the 250 except for the top end, does that mean you can mate a 400 crank, piston, cylinder & head to a 250 bottom end?  Just one of the things that goes through my mind when I can't sleep!!

[imported_n/a]

Greetings to you down under!

I had heard that the engines were virtually identical, so I tried to fit a 400 top end on a 250 bottom and found the studs are not in the same position, nor is the stroke the same.  Good question, though.

Welcome to POG.

Glenn

[vmx1963]

Thanks Glenn, as we say down here "bugga"... I was hoping to make a 400 somehow.