so long at the o-ring grooves are intact and were they should be I doubt you will have any issues. However, I would lap the shit out of it to make sure it is as flat as can be. to take it a step further, pull the cylinders and lap those surfaces as well, then measure the distance between the top and bottom sealing surfaces of the cylinders. at that point everything should be height matched, and as flat as can be. sealing should not be an issue.