Main Bearing Clearance

Rodzilla said
Undersize bearings ARE when the bearing thickness becomes thinner to accomodate larger journals. Oversize bearing ARE when they become thicker to accomodate ground journals. End of that story.

But thanks to everyone for their input.

N.E.G.A.T.I.V.E.

UNDERSIZE bearings are for use with UNDERSIZE crank journals.

UNDERSIZE shells DECREASE clearance

http://www.carcraft.com/techarticle...rmance_engines_bearing_clearance/viewall.html

I suggest you download and read these two Clevite Catalogs

From here:

http://www.mahle-aftermarket.com/C125790900540AC0/vwContentByKey/W28P2MXF358STULEN

Performance catalog:

http://www.mahle-aftermarket.com/C125790900540AC0/vwContentByUNID/97C716A640FD0B1AC12579AB0062923E/$FILE/EB-40-07.pdf

Master catalog:

http://www.mahle-aftermarket.com/C125790900540AC0/vwContentByUNID/58A5032D3003098AC12579AB00615520/$FILE/EB-10-07.pdf

A direct quote from the above master catalog, page 29: