[decooney]

I once had a FE block that not a standard 428, it was not a 428CJ, and not a 427. It had the extra webbing and the unmachined sideoiler boss below. Searched high and low for an answer as to what it really was. I spent a bit of time calling into a few people at Ford. Had the raised 66-427 insignia on the back of the block just like some of the 390 X blocks had. I was told by two different sources that said there were various blocks from 427 castings that were used for industrial and street use that were machined as 428s.; apparently some castings were being shared between 427s and 428s during an unspecified period of time. The bore and internals were all 428 and I kept it as a 428. I never found anything in print anywhere to back this up, only a few tips from some Ol' Ford plant guys still around.