I currently have a forged 355 with a 9.8:1 compression. I have a vortech s-trim. I will be upgrading the heads with a larger chamber AFR but the motor can handle more boost as is, so i want to step it up before i hit the dyno next week. I am running a 6 inch crank and 3 inch blower pulley set up which is giving 6-7 lbs of boost with my setup.

I am installing a meth / water injection kit and my question is which blower pulley will get me to 10 lbs?

can this be done with just changing the blower pulley?

Thanks , Will

 

I'm running the 7" crank pulley and the stock 3.3" SC pulley on my S Trim. I'm seeing 10# of boost @ 6,200 rpm using a Brad Brand solid intake tube and the Vortech aftercooler. I have mildly ported stock heads with 2.0/1.56 valves; your heads will probably flow better reducing the boost (that's a good thing!).