can someone post a pic of a mid '70's 350 crank and a 400 crank, both from the flywheel end, I am most interested in the flange the flywheel/flexplate bolt to.

thanks

 

I can show you a mid-'70s crank, but I don't have anything on 400s:

 

400 counter weights don't have the nice smooth radious like all other SBCs, they're sort of flatened

 

I can also show you a "late '50s crank", but that might get me banned. Or did you meed more detail on the flange?

 

thanks for the help guys, I figured it out. I bought a 350 from a guy that didn't know alot about it, it was in a car he bought and wrecked, he said it had alot of power. when I got it home I noticed that the crank looked different than the 350's I'm used to ( I thought), I was hoping that it was a 400 crank (383). but when I pulled the heads and measured the stroke it came out to 3.48" which is truly a 350.