i bought what is sappose too be a 6lb pulley off of ebay for my powerdyne and its not even set up like my 9lb as far as backspacing and stuff. Then i measure it and it is bigger in diameter than the 4.5lb pulley is sappose too be.. guess that explains why i was only getting 2-4lbs of boost, So right now im running the 9lb and ive got it where its not slipping and thats a bad deal.. too much boost getting alot of detionation up top and i dont think that will last long on my 195k stock motor especially since i like too drive the **** out of my car, so im looking for a 6lb that is set up for an Fbod untill i can get a lower C.R short block in there anyone got one? id like too come up with somthing pretty quick.. guess ill just loosen it up a bit so it will slip and not make a full 9lb like it will if i stay in it untill i can get a pulley LMK what you guys got im trying too avoid paying the $65 or so that they go for new, Thanks

 

Do you have a boost guage?
My 9 lb pulley only reads about 6 lb of boost.
Do you have a S/C tune?
My car ran fine with no pinging or detonation
with a Madwolf tune even before the Trickflow heads
which lowered my compression to 9.75 to 1.
Because of the lower compression I've added 2 degrees advance with LT-1 Edit more or less across the under 4000 and over 4000 rpm tables and the car runs even better.
However if you want the 6 psi pulley you can buy it direct from powerdyne.

http://www.powerdyne.com/beltsnpulleys.htm

 

mine is pinging at higher RPM and so far the most i hit was 8psi and i let out..i just happend too be watching the guage. It gets up over 6 psi pretty easy around 4k RPMs as long as the belt doesnt slip. It pings on anything over 6psi right now.. and too answer your question no i dont have a tune yet.. im here in Ed wright territory and i plan too go too him but i has hopeing too get some other things done before i got spend the money and see him so i can just knock it all out + i plan too go with a 9:5 forged piston short block within the next couple of months. Id also like too pick one of the MSD BTM boxes pretty soon. ultimatly id like to ditch the 9lb unit pulley and go with a 7in crank pulley.. things slips way too easy and im pretty perinoid about cranking down on the belt tension too much. Right now im just trying too enjoy it but keep it safe has a hella miles and the motor is getting tired and i drive it ALOT about 100mi a day, but that is gonna change in the next 2 weeks too about 1mi a day haha.. then i can get *** deep in this thing and get some more **** done too it, Thanks for the input