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Because "B" (361/383/400) and "RB" (413/426/440) engines use different size main journals, each will have a different size main bearing. The "RB" uses a 2.750" main journal diameter, while the "B" uses a 2.625" so the two sizes are specific to each engine.


RB Engine (Tall Deck) 440-426-413 Main Bearings
RB Engine (Tall Deck) 440-426-413 Main Bearings
B Engine (Low Deck) 383-400-361 Main Bearings
B Engine (Low Deck) 383-400-361 Main Bearings