First couple heat cycles on header gaskets, you have to tighten them hot. Once the gasket takes a 'set', they shouldn't loosen. if they do, they are moving around for other reasons.
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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
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1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
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