Im at a loss, Im running the smallest pulley possible a 2.32 .hey Brad. What are you running for an intake off the supercharger? And what exhaust? Im curious to see your numbers

 

What rpm are you makeing 12 psi?

 

I'd be really surprised if your valvesprings are giving out at just 6 PSI. My buddy's 96 hit 18 PSI once when his waste gate reference hose popped off.

 

I'll have to measure the pully, I am not sure

I am still playing with a couple issues like lean A/F and "low" fuel pressure.

I can hit 12 psi at about 4,000rpm

Banks Torque tubes, y-pipe and full single 3" exhaust

K&N element

 

What boost gauge are you using? Also, where is it plumbed?

Have you inspected the charger fins?

What other gauges do you have?