[PFM]

Steven,

I tried to resist but had to respond. FWIW my first flat 6 rebuild started with rebuilt rods from a source I have used for years that ended up with wrist pins that were not parallel to the crank bore, the result was a deck height measurement that was about 2 thousands off front to back of piston, remove the rod rotate it 180 degrees re-install and test the 2 thousands did not quite repeat the other way... odd. Grabbed a "stock rod" tested again had about .005" difference in deck front to back, repeated with rod rotated as above.

Long long story short after the rods were done for the THIRD time they were OK but some deck height taper existed like yours, a straight edge proved nothing. We blocked the case up on a plate and measured with a good height micrometer and yes when the case was machined for stock bearings it must have been clamped on some shavings as the case cylinder bases were not square to the crank bore, however they were "flat" from cylinder to cylinder. Both sides to some degree had this problem. At the end of the day I had to re-machine the case my self. The end result was a cylinder base parallel to the crank bore, even deck heights from cylinders 1-3 and 4-6 and flat across a single bore.

Trust nothing measure everything and write it all in your build book.