Originally posted by robot
as I remember, a 400 small block has 3 freeze plugs on each side and a 350 has two. However, it isnt clear if there were 400 blocks with two also.....IF it has 3 on each side, it is absolutely a 400.

It only has 2 freeze plugs on each side(1 behind the motor mounts, & the other on the opposite end of the block) So, can anyone help me out with decoding the engine #'s?