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what I'm wondering is, how thick are the cylinder bores in the 5.7 blocks? is there any difference between the 6.1 and 5.7 at all?

Some have said the early 5.7's could go to 4.00 bore pretty easy. The 6.1 ALL had 6.1 cast in the skirt by the pan rail and they ALL had oil jets installed. If you are wondering about wall thickness, I wouldn't be surprised if they are similar.

Mopar to the bone!!!