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The most common reason for this would be that the engine was not tuned properly for each set of headers. I can't count how many times I've heard people say that they lost power when putting on headers. When you asked them if they rejetted and optimized timing and such to take advantage you usually get a "deer in the headlights" look from them.
Well I recently picked up a 1976 F-100 with a 302 and a 4 speed transmission. The man i picked it up from had a mild cam put in it, an intake, and a 4bbl holley carb. Im looking to put some headers on this and an exhaust. So I was wondering if headers from mustangs would work or only trucks? Also should I put on long tube or shorty headers?
Long tube, small diameter headers- build tq at lower rpms. recommend Hooker, BBK or Ford motorsport.
All the Hookers with 2.5" collectors have 1.625" primaries. I have yet to find a 1.5" primary 2.5" collector header which I think would work best on my stock 302. The headers I do find with 1.5" primaries have 3" collectors....weird. Havn't seen any tri-y headers for my appl. though.
Did you look at the link I put up? All the headers on that page have 1.5 primaries and 2.5 inch collectors.