when ordering bearings you need to look at the block and the crank for the corresponding codes for the main and rod bearings.... im guessing your using the stock ls rods so just get a manual (haynes manual from discount auto for $11 works fine) and check the factory codes for the color bearings you need. The manual will explain exactly how to do it. If you decided to use endyn pistons and the eagle rods eagle rods are sized for a #3 bearing...