After 4 different manifold gaskets, felt pro, Hedman twice and I don't remember any other brand, everything leaked in 2-3 months. I put them on after a few heat cycles and they were still having issues. I ended up going to the local speed shop instead of the national chains and online shops. They recommended them but they weren't available for my AMC block. They said if that doesn't solve your problem then your headers are deformed or there are burrs on the headers. Fortunately, the problem has been fixed. I will use them first in my next header project.
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