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Drill bit test....the shank of a 13/64" drill bit will fit snugly between 428 wall cores. If for some reason a 8/64" bit fits those are 427 thickness walls. With the std 428 wall cores it will be to close to tell and sonic check is advised. Knock out the three freeze plugs on each side to access the wall cores. This will really only tell you what wall cores were used in casting the block. Core shift will also determine the sonic results for the .070 overbore. I've run 428 CJ blocks up to .060 with no problems FWIW. G.
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