Okay, cases now picked up and examined. Mis-matched, unfortunately, but that's okay as the price was right. What I have are:
Casting # 24534 52
Belly Number: 554-22747
Casting # 24558 52
Belly Number: 554-1025
Numbers look good. There appears to be a weld around one of the bushes on the LHS, but well repaired. A touch of corrosion from what looks like spilled battery acid or something, but overall quite nice. RHS seems to be good.
So, now to build the thing. I have leeway with how it's built from the flywheels up, so I was wondering at what people recommend. I'm after reliability with a hint of what extra a KHRM might have had over a K. Can these things be converted to ballbearing motors, or is it better to go with something else for the street?
Should I look at standard K flywheels, rods, etc, go aftermarket, or look to what can fit from later sportster models or even tuned K variants?
I've ordered a bunch of shop and part manuals from Lonnie at Antique Cycle Supply, and am starting to look for more info as it what can run on these through the archives, but if anyone can recommend the basis of a good street engine it would be appreciated.