yes i called mazworks and they didnt really anwser my question either.... however i stumbled across this and decided to call JWT and they were awesome.
Project Low Buck Nissan SR20DE Part 2 > MotoIQ - Automotive Tech, Project Cars, Performance & Motorsports
so these bearings are not really designed for the purpose of lubricating the crank better(although they do that) it is to force as much oil into that hole on the crank as possible to get maximum oil to the rod bearings. the calico coating was recomended by JWT not only for its friction and oil repellant properties, but the fact it tightens bearing clearances, which increases the oil pressure between the bearing and crank which forces more oil into that hole. but JWT only recommended this if you know your crank is straight. there is a guys that comes into JWT this afternoon that is the expert on this and im going to give them a call back to get the exact measurments...
in the article above it perked my interest into a full crank scraper/windage tray as well....
ill keep you guys updated for the select few who want to buil high HP, high reving, reliable SR's