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opinions on best underdrive pulley kit??

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Old 11-25-2003, 03:36 PM
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opinions on best underdrive pulley kit??
just need some opinions on best underdrive pulley kit for ls1 before i buy mine. if anybody has hp gains from this mod, please post them.
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Old 11-25-2003, 06:02 PM
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as far as i know there is only one that is actually designed for the ls1, it's made by ASP.

i remember speed inc did a dyno run with it on a project car and got 8hp from it.

i think it's a worth while mod if you have the money for it.

i've got an install iinstruction on my web page
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Old 11-25-2003, 07:03 PM
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ASP has proven to be a good choice for ls1s.
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Old 11-25-2003, 07:54 PM
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Re: opinions on best underdrive pulley kit??
Originally posted by HtownZ
just need some opinions on best underdrive pulley kit for ls1 before i buy mine. if anybody has hp gains from this mod, please post them.
The ASP is pretty much a guaranteed 8 horsepower. I'm waiting on the SLP one that is coming out in January. It has a guard around the outside so you dont throw the serpentine belt.
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Old 11-25-2003, 07:56 PM
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SLP screwed up on their first attempt at making pullies.ive had no belt problems with mine and its been on almost two years.
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Old 11-26-2003, 09:34 PM
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asp has been the best pulley since 1993 w/ the LT1..
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Old 11-26-2003, 09:54 PM
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so slp is bringing one out on january??????
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Old 11-26-2003, 10:40 PM
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How much did you guys pay for the ASP pulley kit?
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