Re: Ford engine number identification
The engine cubic inch isn't stamped on the engine, although some 428's had a 428 in the casting inside one of the freeze plugs, or water jacket.
Some blocks have a "428" cast onto the floor inside the water jacket. There are two common positions to view this protruding number: one is just inside the center freeze plug hole, the other is directly beneath the long coolant slot at the rear of the block. If present, you can be sure the cylinders are thick enough to support 428 pistons, core shift permitting. If the number is not visible from either position, you'll need to make other verification checks. Measuring the gap between cylinders using a drill bit is the easiest way to determine whether your block is capable of supporting 428-sized cylinders. It is presently thought that if the shank of a 15/64" drill bit will NOT fit between the cylinders at any reachable spot in the six core holes, the cylinder will likely handle a 428 bore, core shift permitting.
"428" Casting Mark Inside Water Jacket
Now usually this is for a CJ block, but Ford did all kinds of off the wall things so you have to work to find out what you have.
You need to check the bore and stroke, check the date code under the block at the oil filter, and check the casting numberon the block, on the right side of the block towards the front. It will say somthing like, for example "C6ME-A" Ford only gave a few clues as to ID ing their engines.