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What are the dimensions of the upper and lower blower pulleys on an 02' Lightning and do you measure them from the outside edge of the pulley. I just bought this truck used and the boost is 10 lbs. I thought that 8 lbs. was the max. The truck appears to be stock.
From the outside edge - the lower is 7 7/8" , the upper is 3 1/4. The lower is most commonly changed. And yes the factory boost gauge often reads to 10lbs.
Hope this helps.