On the wife's Small Block Vette, we had header gasket failure about every 3 to 6 months. Diffent gaskets, same problem. Finally, I threw two solutions at the problem at one time. Soft Copper Gaskets (Mr. Gasket, I think) and Stage 8 bolts. Whether it's the bolts not trying to come loose, or the gasket being indestructible, I don't know. I only know the combination works. The headers aren't fancy, just a pair off-brand shortys, but they don't leak anymore.