Nickel in blocks???

[cook_dw]

EDIT: Sorry I would not have replied if I had seen Bruce's post above but his post was done while I was typing mine.

I don't believe anyone was arguing that the hardness of one block vs another was the issue. It was when you (or someone) were correlating hardness changes to composition changes being one in the same. These things do not always go hand in hand. Like Bruce (or whoever it was) mentioned; you would have to do a statistical analysis of a sample from each sample of block. Even then if the mixture time was not evenly mixed you could have higher deposits in one side of a block or even mix to mix or pour to pour. But at the end of the day the same composition is used. My guess is that GM did have quality control for each batch and maybe even throughout each batch if I had to guess.