What is the thinnest the cylinder wall should be if you bore out a 340?
I recently had a block ultrasound and magnafluxed and they told me I could safely bore this block out .080. It is a stock bore 340. Meaning a maximum bore size of 4.120.
I have never heard of going more than .060 over on a 340 block, and these are known for overheating issues with more than .040 overbore
you need to speak with a reputable engine builder preferable with experience and success in small block mopar. Square decking, align hone mains, boring with torqueplates are all absolute necessities if you want to build a powerful motor that will stand up and not break.
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