Originally posted by stepmar2:
For anyone who hasn't visited Sho Shop lately....They have an UDP set that allows you to retain your stock HD. $199


Same exact set that has been on their site for many years!

The stock harmonic dampener was designed to work attached directly to steel crank snout. Not with an aluminum medium between it and the crank. Think about that for a minute...


Also if you add the 3+ lb SHOShop pulley to the stock pulley (piggy-backing it as they "recommend") you now have a pulley combo that is over 3lbs heavier then stock (over 2lbs heavier than a DMD!)
That does not sound like an advantage to me?
Yes you still get the 17-20% underdrive, but in my experience I could not feel a difference between the stock pulley and the SHOshop pulley. (by itself even!)
The only gains I felt from UDP's were from adding the P/S pulley & an Alternator pulley. I did these at once and I'm sure the P/S pulley was 90% of the gains. I mainly did it to protect the poor accessories from the high rpm levels the engine lives at all the time.

2000 SVT #674 13.47 @ 102 - All Motor! It was not broke; Yet I fixed it anyway.