Bore

[Thor06]

Jake (EclipseGST) once told me that 2.0 blocks can go out quite a ways. 2.4 and 2.0 blocks use the same casting and the bore of the 2.0 blocks is 85mm while the 2.4 is 86mm. He says hes seen 2.4's go over .040 so you should be able to go .040 over on a 2.0 block and still be perfectly fine.

If you can get away with just honing and new rings by all means do that but I wouldnt be scared of boring the shit out if you have to especially if you only go out .020.