ford has what they call series(family) for there engines

351c is in the 335 series..

429/460 is in the 385 series..

then theres the FE series 360/390/428..

than theres the windsor family 302/351w..

it was chevy who started the small block/big block difference...

and I asked this how can a 396 be a big bb and a 400 a small block??

is it cubes or external size/weight or inline/canted valves that cast them into bb or sb......