273 Cylinder Bore .004 over spec

I rebuilt a 360 that had 0.008" cylinder wear and it ran fine and didn't burn oil. I thought it was a bit much but after looking in the service manual as pointed out in post 52, I decided to send it and haven't had any problems. Back in my younger days still in high school, my brother was going to the local Community College for auto mechanic and they needed a block to do some training on the boring machine. I had bought a worn out 340 block and let him take it to the class who did a 0.020" overbore on it. I got it back home and put standard pistons in it with 0.020" over rings and it ran like a scalded dog. It just had a little piston skirt slap when you let off it. I don't remember it burning oil. It didn't smoke. I ran it hard for a couple of years until I couldn't stand that stock cam and was in better financial condition and decided to redo the whole engine going to 0.030" with new pistons and the works and of course a big cam.