Engine bearing catalogs, or AERA spec sheets.  I find almost every time that main housings, and cam housings, are on the big side of spec or .0005 over spec.
Graig in Wyo

Last edited by Graig (1/17/2017 1:42 pm)

I found the same things with the printed material as with Pro-Sis that gaps or misprints were in several places but mostly in the same engine family or brand/make

And also watch out for different bearing size options. Most bearing suppliers offer bearings in both SAE and Metric sizes but .010 is not the same as .25mm and so on.A .010 bearings is not the same as a .25mm bearing.

Most printed material shows the journal or housing bore Min/Max spec along with the bearing sizes available. Be sure to be on the same page with your crank guy on which journal measurement you want him to use when grinding. I have been fooled a few time over the years when asking for a crank to be ground .010/.010 and ended up with .25mm bearings and vice versa and had more/less clearance then I wanted.

Most detailed information can be found on may web sites these days and while it is a good practice to measure the housing bore prior to machining them it will give you a starting point to work within the case of odd ball engines or older engines not commonly seen like 30's through 50's stuff as they were just learning how to build better more powerful engines.
Farm tractors are another area where check before is critical as so many things were cross bread back then and even today.

There is lots of engines like the european japanese stuff that specs seem to be a guarded secret again measure what you have before machining anything