Quote Originally Posted by BigCountry1488 View Post
what does the 4.0250 mean and just to be clear you were talking about the bore being 030 over. and yes it came out of motor home the block is a 1961 4bolt main
that is a 4.250 crank and a 4.280 bore is a 030 over that is a 489 cid . 1961 ?? never seen one