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This QR code on the crankshaft and the corresponding code on the block tells the assemblers what bearings to install. There are three bearing sizes to choose from, dubbed 1/Blue, 2/Yellow, and 3/Green. Depending on variances in the block and crank, the bearing sizes may be mixed and matched. In the case of the engine we are following, it was designated to receive all Number 2 (Yellow-coded) bearings, which is a rarity.