Curious what headers you have? My car had Hooker Super Comps on it when I got it, they had been "clearanced" in several places. My father has Dynomax headers on his car, the only place they are tight is near the oil filter. It is a huge PITA to get the oil filter on and off. Never thought I would say this... but I cannot wait to pull those headers off of his car and put factory manifolds back on it.
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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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