Ok, I just measured my lower crank pulley and it is about 8 7/8" in diameter. My upper KB pully is exactly 3 1/2". What kind of boost should I be making?

 

Well the lower sounds like a 4lber (8.75), the upper being a 3.5 incher your are only making 11/12psi of boost I would imagine.

Do you have a boost gauge?

Bob

 

I am installing the gauge this weekend, I only have the stocker, it goes a little to left of 10 at max!!

 

Hmmmmmm... This may be why the truck feels so slow off the line compared to my Eaton..

 

Yep...thats about right. You are not making much boost with that pulley ratio.

Drop on a 3.25 upper and get about 14/15psi

OR

Like me ----> not recommended but extremely fun

Put a 9" lower and a 3" upper on it, get it tuned and HOLD ON!!!!!!