Building a Motor Need Help.

Hey guys,

I'm starting to buy some parts to build a Turbo B16.

Now so Far I have a set of Eagle rods on it's way, and gonna pickup some bearings.

Now for the Block I'm using a B16A(second gen) Bottom end.

what I plan on doing, is Running a 9:1 CR, with 18Psi of boost.

Port and Polish head, 3deg valves, dual valve springs, SS Vales, Aluminium retainers and Possibly a stage 2 Crower turbo cam.

The turbo stuff I already have...

Now for the bearings, they come in "oversize" what does this reffer to ?