Thread: 66 GTO headers
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Old 05-15-2026, 06:54 PM
1950Mercury 1950Mercury is offline
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Default Doug’s headers

Has anyone had any first hand experience with Doug’s headers D564 black stainless or coated headers as far as fitment issues etc on a 66 GTO 4 speed car. I’m just trying to avoid opening a can of worms. Or maybe just go for the HO headers that are supposedly designed for the early GTO’s. Are there slight differences on how Doug’s fit a 67 as opposed to 66. I see where some have had to modify brake lines.