Does anyone know if all (or most) of the 400 small blocks (particularly pontiac) had 4 bolt mains?

pontiac does not have a small block their 350 has the same outside deminsions as thier 455 as small block chevys no not all are 4bolts

Hi, I have a 400 small block and it is a 4 bolt main!!! Chevy made the 400 a 4 bolt main from 1970 to 1973 in their 1 ton trucks, then they made a 2 bolt main 400 from 1974 to 1980!!! i hoped this helped.