Do yourself a big favor.....talk to the machine shop and have them port and smooth the oil passages in the engine block where the oil pump mounts to the block and the front 90 degree drilling that intersects the rear oil galley going to the rear passages to the oil filter ports. Check the oil pan and filter passages and port and smooth these passages too. The oiling system on the LS motor flat out SUCKS! for extended high RPM operation. The 2.00" rod journals are fine....that is the size of the original Small Block Chevy......worked well for many years with a good multistage dry sump system.....rod/main journal sizes can be further reduced as NASCAR has done to minimize oiling system power losses by reducing oiling system demands but, you had better have a good engineer helping with system design. NASCAR made 900HP 9000+RPM motors last for 500+ hard miles of racing with small Honda/IRL rods.....typically 1.88" journals. Frankenstein cylinder heads has one of the better LS3 CNC programs at this time but, don't know how backed up they are for deliveries.....if going aftermarket it's hard to beat the TFS head or MAST LS offerings.
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