350 engine .080 overbore

really bad.. good price but I'd hate to see what will happen if you put

I do not think I would even fire it up. 040 over is considered max and

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Interesting. I have a 350 bored to 4.15 and it runs in the 10's. It's a Chevrolet Bow Tie block.

Al

Consider it the exception not the rule. There is specail blocks out there that will take a bigger overbore and that have siamezed cylinders. A stock 350 block will not do that becaue there is not that much meat in there.

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Who did the work on it? If they did a scan of the block to detect core shift and it has the thicker walled block it MIGHT be OK.

Even still I would be worried about the likelyhood of sand cast holes with thin walls.

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For dirt track and 1/4 mile racing we had the blocks checked some have thicker walls some can go out farther than others. As far as .080" I would check to see if the block has been cemented (epoxy filled) look down in and see if they filled the block. We have done that to 1/4 mile engines, makes them stronger and doesn't hurt because they only go 1/4 mile at a time, don't have time to get too hot. But stated in previous .060" is usually too far and can fail... I know I would pull out all the good parts and just throw them into a different block, but that's me and I have a half dozen or so 4 bolt blocks on the bottom shelf just waiting for parts. $350 isn't bad for a bunch of good parts...

Just my opinion or comment,... Good Luck Earl

Thanks for the comments... I just hate to throw away a block that is so shiny! It is a 4 bolt main, with a lefthand dipstick so it is a 70's engine. ( I haven't ran the casting numbers to see exactly what year it is, but being 70's maybe a better chance of being a good casting? ) Worst comes to worst, I guess I have a good crank, bearings, timing chain set, new Howards solid cam .510 lift 288/288 duration ( spec card was included :) ) , new oil pan, balancer and t- chain cover, rods and oil pump to save. Next question.... if I feel brave and bolt on some heads and try it, what would likely happen IF it fails? I assume it would be a cylinder wall failure, which would take out the block, piston, (which wouldn't matter much at that point), and anything else? Most likely the crank and heads would survive, maybe? I'm still thinking that for the price of a gasket set and my labor, if the rest of the good parts would be salvagable after a failure I might just try it in a street vehicle. ( but not for the track because of the heat and stresses ) What about this idea? Again, I really appreciate all comments, thanks! Earl

GM also made a 400 SB with a 4.125 bore but it had siamezed cylinders (no watter between them) to allow for more wall strength. .080 over is a lot of material to remove from block (.040 on a side) and too much too for a 350 block. The eprson that built that motor likely had second thoughts about it and got rid of it. Strip the good parts off of it like someone suggested, scrap or sell the bare block and call it even.

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