[olddog]

Even Ford took 390 blocks and bored them and sold them as 428 replacement blocks.

So, I have to ask: one engine is a block that started out as 390 that has been bored (with plenty of wall thickness - no overheating problems) and now has 428 pistons and crank in it. It is a true 428 now. Another engine always was and still is a 428. Other than the origin of the blocks they are identical. Is there any difference in value?