Allow me to better explain in detail & why I asked about more info.
I have seen many K & K2 combines with a complete older (1960s) header small 4 hook setup. Meaning they contained upper "outer pin lock plates" with a corresponding "spring pins tube installed) that were added to the "upper" front of their threshing throat(housing) making them useful for either gleaner cornhead color. Gleaner engineered usually did a great job of manufacturing machines for a longer customer continuity via multiple era attachment(headers,etc). ALL of the K2 combines(1977-1981) were manufactured with "upper slots" machined into their front threshing housings(throats) to allow for older headers. The earlier 1977/78 K2 models usually contained additional "outer pin lock plates" factory installed(welded in) & possibly an upper spring pin tube. The 1979-1981 K2 models usually did not contain the "outer pin lock plates" or accompanying spring pin tube. But if farmer wanted, this prior era setup could easily be completed thru dealership parts counter & repair shop for some welding on this "outer pin lock plate."
In short, a farmer could keep/run their older orange cornhead or opt to upgrade to a newer 1977 debuted black cornhead? Additionally, these older "upper slot/pins" won't obstruct a mounted black cornhead which uses that cornhead's newer "upper larger over the top pipe hooks" which ALL the K(1969-1976) & K2 have an "upper Pipe" attached onto their top front of their threshing housing(throat) to accept newer black cornheads.
I never ran an orange head, but guessing the 13t header drive sprocket drove it??
The double sprocket 25t-13t may be found on salvage yard K, K2, F, F2 machines. It is not difficult to remove/install if you use a puller tool. Counter shaft where it resides is tappered & keyed. Hope this helps?
Edited by AC7060IL - 05 Jun 2024 at 1:39pm
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