The chamber on the K heads was smaller. Thats what jacked the compression up to over 10:1. All the other mentioned stuff every one said about the solid lifter cam, screw in studs, dual points, beefy main caps, etc.. was correct. The GT 350 271hp K code came with a uluminum hi rise intake and a 715cfm four barel with a center hung float. The K code 289's exhaust maniffold was different from the regular 289. It has smother curves and flowed better. The GT350R came with Tri Y's(headers). Although it turned out to be extremely rare you could get the two fourbarels or the three two barrels from the dealer as a option for the HiPo 289. I've read in two books that even though you got them from the dealer they were considered factorry parts. Sounds lile a counterdictory term to me. The other wild thing you could get from the dealer in 66 was a paxton suprecharger. The book that stated this said thi was a 400$ option that they had no record of anyone taking advantage of, although reportedly Carrol Shelby did outfit a few GT350S in this manner for close friends. Tony Branda offers some nice repro parts if you want original style show and go.
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