What head gasket sealant is the best?

[outlaw]

Head sealant.jpgI'm gonna throw out a suggestion here. I have been chasing a problem with my wife's off topic turbo charged suv. It has been throwing a code for misfire on #1 cyl at startup. I have replaced everything that is suggested to possibly cause it to no avail. It also was using a small amount of antifreeze every week or so randomly. The previous series of this motor had a known block issue that caused this (between #2 & #3 cyls) and the cure was a new motor. I picked up a bottle of this CRC head gasket & block repair. It cured the problem so far & it's been over a month with no codes or antifreeze consumption. I don't know if it would work on the flatheads, but it might be worth a try. It has some type of mil-spec fibers in it.