Just to let everyone know that ProMaxx cylinder heads will also rework your cylinder heads or sell you a new set. I just received back four cylinder heads that I sent to them to be reworked. They magnafluxed, replaced all the seats, guides, decked, and pressure tested and sent them back. It was about 1/2 the cost of new heads, the machine work looks great and I am very pleased with the outcome. I would recommend them to anyone. Now all I have to do is finish the 6.0 I have apart in the shop, now on with the build.