Well I spent a little time today investigating what the doubters have been saying about calibration's and testing of blocks that seem too good to be true, and what I found in the limited area that I was able to physically check my self and found that on the two cylanders at the rear of the block (#7-#8) mechanically checked out to be the same as what the paperwork said it was,, driverside, the paper said .290 and was real close to what my machinist's scale said it was and #7 had the same results,,so I have convinced myself that his calibration was correct and I have two good blocks to work with.