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Old Dec 20, 2013 | 02:53 PM
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Default Udp?

Im thinking about a 25% UDP for my birthday in a couple weeks, but Im running into a little confusion. My LS3 has the vette front drive setup. Am I right in thinking the c5, c6 LS1, LS2 and LS3 all have the same offset on the crank pulley and interchange? That's what I am gathering by my research, but Summit doesn't show the C6 LS3 on the app chart. It just goes up to the 06 LS2.
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Old Dec 20, 2013 | 06:32 PM
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I don't know the answer to the offset question, but I have read from some engine builders who say do not use the 25% pulley. If you have to use underdrive, use the 10%. The 25% supposedly does not have enough mass to effectively dampen the harmonics.

I have the Vette accessory system on my car, but it was the LS2 style. I would think they are the same, but I am not sure.

Oh, and one more thing, ATI for the win!
http://www.atiracing.com/products/da...s/damchevy.htm

ATI lists the LS3 with the LS2 and LS6

http://www.summitracing.com/parts/at...9/applications

Last edited by speedtigger; Dec 20, 2013 at 06:48 PM.
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Old Dec 20, 2013 | 07:43 PM
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Thanks Tigger. I had seen a couple companies that listed them all together. I just needed some more confirmation before I pulled any triggers.
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Old Dec 20, 2013 | 08:16 PM
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May also need to change the pulley on the alternator so it charges at idle as well (like stock)....found out the hard way on the old 406ci SBC
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Old Dec 20, 2013 | 08:52 PM
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Originally Posted by Doug G
May also need to change the pulley on the alternator so it charges at idle as well (like stock)....found out the hard way on the old 406ci SBC
Yep, got the Tshirt on that one as well. I have the whole March UDP setup on my 406, LOL. Most that I have looked at claim 900rpms will give full charge with the vette alt. I idle at 850 now, so a bump to 900 shouldn't cause any issue.
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