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ASP seems to be the most common. Usually they are done during a cam install due do the amount of work involved. (Steering rack removal). They are worth about 5 to 7 HP increase. :cheers:

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I did a cam install with no pulley and pulled 405 at the wheels...I added the pulley about two weeks later and put the car on the dyno again. It pulled 405 at the wheels. This was on a bolt on, cam only, stock heads Z06. I didn't gain one bit of power with a pulley. :mah:
 

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RobGrnfld said:
Hey Casey, I'll buy the ud pulley from ya' if you'll pay for the labor to have it installed...:pp: :sneaky:
:lol: Rob, I don't think that's going to work for me. It could be giving me some HP on the 383...no way to know. Good try though! :D
 

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It's always been thought of as kind of a "while you're in there" during a cam install. Some say the ASP's are better balanced than stock.
 
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