whats up with pulleys??
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TECH Enthusiast
Joined: Jul 2003
Posts: 608
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From: fortress of solitude
whats up with pulleys?? since no one would answer my question i figured i start a new post 
whats the difference in the percentage of underdrive (i.e. 10% vs 25%). ive seen a crank and alternator pulley set and a "special machining required for use w/ SLP chain" is this only for that chain or is it more of a necessity??
whats the difference in the percentage of underdrive (i.e. 10% vs 25%). ive seen a crank and alternator pulley set and a "special machining required for use w/ SLP chain" is this only for that chain or is it more of a necessity?? 
TECH Fanatic
Joined: Jun 2002
Posts: 1,227
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From: Indianapolis
The crank pullies are 25% underdrive. The alternator pullies are 10% or 25%. I would just keep my stock alt. pulley. The undredrive alt. pullies can cause low voltage situations. The machined ones are for double roller timing chain kits.If you have a stock or single timming chain you dont need one. ASP is the most proven out of the bunch. Tony
Originally Posted by 98SS Blackattack
The crank pullies are 25% underdrive. The alternator pullies are 10% or 25%. I would just keep my stock alt. pulley. The undredrive alt. pullies can cause low voltage situations. The machined ones are for double roller timing chain kits.If you have a stock or single timming chain you dont need one. ASP is the most proven out of the bunch. Tony
no machining necessary on ls1 in camaro and birds
