Endyn's note:
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We recommend that only a single pulley be used on non-modded blowers.
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The blower needs to be modified if you want to boost higher than 9 psi. The heat generated at boost levels higher than 9 psi can cause premature failure of the blower, whcih can in turn send pieces of the rotors into the engine causing lots of damage.
If you plan on running 9 psi, replace the passenger side jackshaft pulley, not the blower pulley. Replacing the blower pulley requires a smaller pulley, and that will reduce the surface area contacted by the belt, increasing the chance of slippage.
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Also when swapping out the pulleys do we need to get different size belts too?
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You will not need a different belt with the replacement jackshaft pulley. I don't know if you would need a different belt if you replaced both, but I doubt it.
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I will probably be doing 440cc injectors
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A good choice for 6 psi. I personally would not feel comfortable with 440s for 9 psi on stock internals. However, I'm not certain if larger would be necessary for it.
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Yeah,yeah,yeah....... on the injectors already!
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