I bought my '68 40 a couple of years ago and am all over the board on the upgrades I want to do. That being said, I'm trying to learn more about the engine swap in my rig. The PO only indicated the obvious (V8) and that it is a 4 bolt main. The numeric code stamped into the block is V0604TYZ. Best I can tell is that it was milled or made in Flint, MI in June of 2004. The TYZ is what I can't seem to find an answer for. Any help from fellow mudders would be greatly appreciated.
