Re: 5.9" Crank Pulley
There is .500" between 5.9" crank pulley and stock water pump pulley. Serpentine belt sticks out from pulley about .150" so that leaves you with approximately .350" to increase the size of the pulley. I would go with 6.1" to be safe. Keep in mind a pulley of this size could cause problems with overdriving accessories. Not sure if it is worth the hassle/risk for an additional 1-2psi.
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