Hot rod dad. No need to get insulting, not knowing about some subject is no crime, everyone is not a fountain of knowledge on all subjects. I happen to have a lot of experience with 6 cyl. engines, no reflection on your lack in that area. I also have done a lot of drag racing, had a 11 second El Camino in 1972 running a 400 smallblock before hardly anybody knew about them. As to 350's there is no distinguishing marks on the outside, but the 400's are easily picked out due to 3 sand casting holes on each side. There are many books on Chev history you might want to go to VCCA.org for the restorers view of Chevys from 1911 to 1972. Be cool hot rod dad, we're all friends here, only want to help each other when we can.
