Anybody know what the proper clearance for the kingpins should be when reaming new bushings 37 - 41 ?
Well I reamed em out to .001 over and they work awesome. Did it with some little fixture bushings and a standard chucking reamer. I just don't like the imprecise nature of adjustable reamers, comes from my days as a tool maker. Anyway one shot through each bushing and the pins fell in with only .001 clearance.
I've always reamed the bushings so the pins will just push in with a little thumb pressure, or as my old German machinist told me when I was an apprentice long ago, "Loose, mit no shake". The only difinitive writeup I ever saw on king pins, said to ream the bushings until the pins just fit in and it takes 5 lb/ft pressure to move the spindle, when pulling from the area of the cotter pin.
You will get a better fit and finish by having your local shop guy hone them on his Sunnen con rod machine. Infinitely adjustable, does both bushings simultaneously, and gives a nice bore finish. Fit is described as a "palm press"