Boring a 360 block

MRL Performance said

I had a 340 that "failed" to go .020" and had to put a sleeve in it. Since 340's are made out of (fools) gold, we had to save it for the customer.

I have seen a few 360 block that I sonic tested that had so much core shift in them, they were down to .070" thick on one side(cant remember if it was the top side or bottom).

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Not one of my 340s sonics worth a ****. Bad core shift and thin castings. Best left to the numbers match resto guys, or class racers that have to use them.
The best blocks for me have been the later roller LA 360s. Much better casting quality, machining, and material IMO.