Technical > Spud Miller's Cave

Blower pulley

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JeffV8:
I'm running a 331 Chrysler hemi in my falcon. I have a 6-71 blower and 4 port Hilborn.  This will be a street driven car most of the time.  Question is what size pulleys to use?? Plus what pitch to use.

Thanks

Paul New:
with the theme of your car I would run 1/2" pitch, maybe a 36 on top and a 32 on the bottom 11%UD or 35/32 8.6%UD

Not sure of your compression or fuel you would be running

JeffV8:
I'm guessing around 8:1 for pistons and run on gas. I was thinking 1/2" pitch.

digster:
 I'll bet you'll be fine with Paul's recipe. For a little more boost you might consider a MSD boost retarder. Mine allows me to run mid grade gas in my street rod.  An 8-71 at 1 to 1 on a 525 BBC.

Paul New:
i think 6% under driven would be a good start

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