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Guys,

I am constantly having to tighten my header bolts. I actually lost two on a 50 mile run last week. This is driving me nuts! Is this common, or will they eventually stop loosening up? I have a 351W with aluminum (Edelbrock) heads and Backdraft split headers. The car is fairly new with only 650 miles on it. I have tightened them about 5-6 times when cold. Any ideas here would be helpful.