I had a machine shop bore my 400, install the pistons on the rods and deck the block. I bought KB Hypereutectic pistons, 9.3:1 compression ratio, and when I get them back, the valve reliefs were on the bottom, closer to the exhaust port, of the pistons. As long as the valve clearance is good, should it be a problem? They rebuild a lot of engines and I am wondering if they screwed up big time. It's been a while since I had it done and now trying to sell the engine. Any info would be helpful. I am adding pics to conversation to show the delima I am having. Isn't the even cylinders on the passenger side of the block and the odd on the drivers side?