Block out of square

"Dang.. Just when I thought I was going to get something useful done for real paying work; you are an enabler, Treblig LOL. I have a 273 block/crank in process right now that is at the stage to be checked; never has been bored or lined bored or anything, with a new SCAT crank (which I hope has a straight flange!). Maybe this evening..."

I bet it's within .005" of being square, I would expect it to be closer. As far a QA/QC.... Even if QC didn't check the back face of the blocks it would take some real poor machining (set up) to install the block incorrectly in the fixture to get it that far off?? That's why they have fixtures in mass production....REPEATABILITY!! But again, the block was align bored, so that's hard to ignore. Let us know what you find on your block and make sure you put a slight bind on your crank (front to back, or check for end play) so that you don't get any "walking". You can easily check the crank flange for straightness by mounting an indicator on the rear of the block and checking the crank flange for straightness (flatness) ....as long as there is no front to back "walking".

One can argue with the machinist doing the work.....but if you piss him off he won't care as much about the work he does for you...LOL. With a machinist, you have to show him, talk is cheap!! Treblig