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Redd Snake
With a sonic test, you will probably get 40 over for a street engine.
My thoughts on wall thickness are not the same as gt-347. I think you can go as low as .110 depending on the thickness on the thrust side of the hole staying at .115 or better.
If you have a 427 that needs to go 40 over, check with the guys at the FE forum. They will give you the best answers anywhere.
John
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