The man speaks the truth.NCOHs13 wrote:Im not a 100% positive but you may be able to take a straight edge long enough to go from one end of the manifold to the other end and see if its level, as in no spaces or gaps between the straight edge and manifold and check corner to corner, vise-verse.You know what i mean. Im fairly certain that thats how they check blocks and such before decking and resurfacing them. I hope this helps you out in some way or another. Good Luck