10% crank and 5% jackshaft

Figures!

I just bought a New 5% JS Pulley from SCP and
someone puts one up for sale....

Good price!

Tom
 
What kind of boost/hp changes would these produce?

From MP "This billet aluminum crank pulley is significantly lighter than the stock steel crank pulley and best of all...it allows for another 10% of overdrive on the supercharger without worrying about belt slippage. Typically adds 3 to 4 psi of boost."
 
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