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ss wannabee · 09-24-2008, 01:02 PM

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!

09-24-2008, 01:02 PM	#1
ss wannabee Senior Member Join Date: Jun 2005 Posts: 663 Likes: 0 Liked 7 Times in 7 Posts	SBC cylinder wall thicknesses? 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!