OK. a few things here.
First off the brass manifolds are from early 1941.
My friend has two different KR engines torn down right now. The KR has shorter cylinders and different flywheels marked with an R. The other engine, which is a KRTT, has longer cylinders and different heads. Does this make any sence?
He has two cast iron manifolds. Neither polished. One with raised numbers and the other depressed.
So I guess one of these will work on his KR.
Chris, your friend has something unfactory, I do believe. The one with the longer barrels may be a KHRTT, or one someone put together, or he may have a short barrel KR, that we were talking about here a couple of weeks ago. You should measure those barrels, and get the info on here. Then these guys will know exactly what you are dealing with. A KR and a KRTT, should be same barrels.
yes kr krtt same barells. khr khrtt longer. but wr k kh kr khr can use same manifold. yes they made brass manifold i have a nos one. is plated. i was wrong went looked mr3 4 bolt mr 4 4 bolt. mr 2 was 3 bolt. i have 2 mr 2 linkerts. all short rod krs i have seen maby 9 sets have sepecial manifolds. some have tubes welded onto barrels. i have schbler alum carb to. is barrell carb.