[MaSnaka]

I understand that 390's can be MADE into 428's by boring and or stroking. What I was trying to find out was...were the 428's that came from the factory installed in a Cobra, built from the same blocks used for 390's or are the blocks different and only used to build 428's? I'm refering to the engines that came from the Ford factory, not aftermarket buildups. In my mind a 390 cannot be made into a "stock 428", but can be modified to achieve 428ci.

The question arose from seeing 428's advertised on ebay stating that they were built from 390 blocks with 2 bolt main caps, sonic tested, etc...

Thanks for all the feed back.

John