Are All 340 Blocks the Same?

Rocky_JS said

One of our vendors MRL performance from his experience, has stated that the later blocks were better than the early blocks as far as core shift.

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That only holds true for later blocks like Magnum blocks. All 340 blocks are junk as far as Im concerned. I have had to sleeve so many of these blocks its not even funny, many with stock bores. the core shift in 340 blocks is the worst. A lot of 360 are pretty bad too.