Trying to explain why a 6/22/67 340 already had a -4 revision (going by core revision theory) so they already were on the 4th core mod or change? That's got to be one of the first batches of 340's out of the plant. I don't buy it: -1, -8 all the same within casting margin of error. Thats my theory if someone wants to prove me wrong with first hand knowledge of Chrysler casting methods. I seem to remember seeing a foundry video of 4 inverted V8 blocks being poured simultaneously.
