LA blocks

I've been looking for a source for quite a few years now, of something I read a long time ago. In the late 80's, early 90's there was an article or book about someone sonic checking 318's and boring them .090" over. Might have been Bob Mullen. They were doing that and welding up cranks for a 4" stroke. Obviously much easier nowadays.

Tha answer to your question - is it depends. Most any block can go .030 with no worries. A very rare few blocks have bad core shift and .060 can be a problem. And the opposite is also true, some have perfect cores and you can go .070. A 318 is 3.91 bore, and would need careful checking to go .090" over by someone who knows what they're doing. A 360 is 4" bore. Rumors have persisted for years about early blocks w thicker jackets.