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What manufacturer cobra do you have? You can probubly send your header out to a good custom header manufacturer as samples and have new ones made in whatever size you need. I strongly recommend Doug's Headers in anaheim ca. Your engine builder should recommend the header diameter.(350 cid, 6000 rpm 1 5/8 : 400 cid, 7500 rpm 1 3/4)The sidepipe primaries should be larger, as they are asthetic as well and what's another 10 hp?
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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