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the core shift will tell you usually whether a block is a good candidate for a large over bore, or just sonic test all of them period...
All blocks can be a candidate for core shift and the more blocks cast from the same core mold, the higher the chance of it happening. And boring to clean up is the way to do it. Some think boring for cubes is the think to do.....Thats the main problem with the later blocks and not just with cylinder bores but lifter bores aswell. My 76 block sonic tested good was told it would handle 60 over no problem. I just went 20 beings how thats all that was needed to achive a perfectly round cylinder.
Depends on how thick the cylinder walls are and if there is any core shift. I've seen bores that were taken out even more that ran cool. A .070 over 383 for example....I was told recently that boring 60 over, you could be more prone to overheating.
All blocks can be a candidate for core shift and the more blocks cast from the same core mold, the higher the chance of it happening. And boring to clean up is the way to do it. Some think boring for cubes is the think to do.....
Depends on how thick the cylinder walls are and if there is any core shift. I've seen bores that were taken out even more that ran cool. A .070 over 383 for example....
I didn't read the whole thing but I already know about the thin wall casting crap never happened.....