Quote:
Originally Posted by 242177P
It's standard bore. Pontiac literature showed 4.12 but
that isn't right. 4.125 *ISN'T oversized. Pete McCarthy
touched on this weirdness. The 428 is actually a 427,
the 350P is a 354, etc. HTH.
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This block is a bit of a mystery I wish I knew the history of it. There is absolutely no ridge at the top of the bore. You can still see some hash marks in the bore and this block came out of a GTO. The block was very dirty with grease and grime and a lot of rust on the exterior of the block. There is evidence that the engine had been apart and/or rebuilt at some point by high temp silicone on the pan rail and in the rear main seal area. There are a couple bores that had enough rust that it would need to be bored to remove. If this is a standard bore it is a low mileage mystery.