.060 overbore?
.060 overbore? will i be okay using a .060 overbore block? I have a 4 bolt block ready to be assembled but had to be done .060 over. Most of the searches say .060 is too much for an lt1 block but ive seen a few stock eliminator guys using them. Its for an N/A motor.
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Joined: Oct 2007
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Any LT1 block can be bored .060" over, but not many should ever be taken this far. The competent machine shops will measure the walls before they do this though. It may look fine to the naked eye, but there is a good chance it will be too thin to fully support itslef properly. I've always heard that .040" is a safe bet. I know it's a c-hair difference, but that's what i've always heard.
Depends how far you are pushing it and if it was sonic tested.
Ed Wright posted within the last week about how his NA 383 is pushing the bores around with a .030 bore. That is making 100rwhp more than most will ever make NA so it does not mean you have to worry.
Personally if the block needed to go that far I would have part filled it, but that has to be done before not only the bores are done but even before the main hone. The whole block flexes more than you would imagine.
Ed Wright posted within the last week about how his NA 383 is pushing the bores around with a .030 bore. That is making 100rwhp more than most will ever make NA so it does not mean you have to worry.
Personally if the block needed to go that far I would have part filled it, but that has to be done before not only the bores are done but even before the main hone. The whole block flexes more than you would imagine.
Not sure if it was sonic checked or not but its a good local machine shop. Id rather not have to worry about it though. Maybe id be better off just having the original motor bored .030 and with just arp main bolts. kinda sucks cause i already got the block ready to go.
edit* wouldve opted for the fill but its all been done
edit* wouldve opted for the fill but its all been done
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Joined: Oct 2007
Posts: 2,630
Likes: 28
Not sure if it was sonic checked or not but its a good local machine shop. Id rather not have to worry about it though. Maybe id be better off just having the original motor bored .030 and with just arp main bolts. kinda sucks cause i already got the block ready to go.
edit* wouldve opted for the fill but its all been done
edit* wouldve opted for the fill but its all been done
To be honest, there are a lot of "good" machine shops that simply think LT1's are exactly like older SBC's when that is simply not the case. Just go get the .060" block checked out.
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