SBC cylinder wall thicknesses?

[SSDiv6]

Originally Posted by ss wannabee

Anybody got an idea what the older SB Chevy blocks (cast prior to 1962) measure up in a sonic test? How does that compare to the best 350 blocks? I think I read that Chevrolet changed or tried to make lighter at least 3 or 4 times over the years.....I think the mid/late '80's were the start of the worst when they started to crack in the valley area....I know a bunch of the early stuff (especially the 265) could be bored out to even .125" SAFELY....but you sure couldn't do that with today's production stuff! I once lifted a 265 bare block and it felt a ton heavier that the 1964-283 we are running....Not talking about GM Performance stuff here....which I'm sure have the 'beef' in all the right places!

Do the smart thing and map each cylinder by sonic checking.