Originally Posted by crsmiffy

you are correct. Ford does it differently to chevvies that have big and small blocks. In reality this has transferred over to fords and is actually relevant. The 400 is in the 335 series family and includes the 302 aussie, 351C, 351m and 400 even though the 351m-400 has a taller deck. Just remember that there is a small percentage of the 400's that have a "small block" pattern. The "big blocks" are the 385 series i.e. 429-460