 but short of using K-Seal, and you can read about it at kseal.com, short of doing that, like I said, if it fails the coolant bottle test, then you're going to engine work, and it may be more than just replacing the head gasket at this point. The threads in the block may have pulled out, and you've got to do block repair, so you may be headed for more engine work than just doing a head gasket.