what kind of HP gains would you expect from the ASP Pulley kit. It runs about $160 compaired to the Mach brand which is aluminum. Well on your cars what did you see just from pulleys and if anyone has a 383 those numbers would be nice to.

 

Here's a dyno comparison using a Hypertech pulley vs. stock:

http://www.ws6.com/mod-2.htm

 

If you get a pully, dont get the once that bolt on behind the stock pully.

Get the expensive ASP that totally replaces the stock pully. I think it runs about $150 by itself, but not only do you get the underdrive, you also lose a few pounds of rotating mass which = more RWHP.

 

I think the HP gain is minimal at best, but it does save wear on your powersteering pump if you Auto-X or road race.