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UD Pulley question/problem?

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Old May 21, 2016 | 10:12 AM
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Default UD Pulley question/problem?

I bought a used SLP UD Pulley for my LS1. I was looking at it this morning in preparation to install and have a question. I can rotate the outer shell with the center remaining stationary. My question is: Should this happen or did I get screwed? I searched and had no luck finding the answer...
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Old May 21, 2016 | 04:46 PM
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Anybody?
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Old May 21, 2016 | 09:14 PM
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So has anyone ever looked at an underdrive pulley that could answer my question?
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Old May 21, 2016 | 10:53 PM
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I don't think it should do that or else the crank would spin and the pulley won't move
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Old May 21, 2016 | 11:43 PM
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No it shouldn't do that.
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Old May 22, 2016 | 10:53 AM
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That's what I thought...thanks. Is there a way to rebuild one? I see it has a large snap ring on the front. I googled that too but come up with nothing.
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Old May 22, 2016 | 12:17 PM
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It should not rotate.
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Old May 22, 2016 | 12:59 PM
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After further inspection, it doesn't even appear to be an SLP pulley. There are no makings on it anywhere for identification purposes, no timing marks and the crank hub does not have a keyway. The guy I got it from told me it was on his car for 500 miles and sent me a link to the SLP UD pulley on TSP stating that is what it was...guess this is one of those bought lessons. I now have a $125 paperweight and still need a pulley for my car.
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Old May 22, 2016 | 01:45 PM
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sorry, double post

Last edited by TimE; May 22, 2016 at 01:46 PM. Reason: double post
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Old May 22, 2016 | 04:46 PM
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Slp pulley doesnt have slp stamped on it. And no stock cranks dont have a keyway.
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Old May 22, 2016 | 07:46 PM
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Shouldn't it have timing marks or a part number on it though? There is nothing on it anywhere. I was basing the comment about markings on the pic from vendors showing the SLP with timing marks. Here's a link to SLP's site... http://www.slponline.com/product/100...e-Pulley.html#

I know that a stock LS1 crank does not have a key way but I had read that the pulley did have a key way in it, hence the reason for that comment. Also Powerbond, that provides the SLP pulleys, have a key way cutout and timing marks.

I don't mean any disrespect but this just doesn't seem right to me. I contacted the individual that I purchased it from. He said he purchased the SLP UD from a board supporter (I'm not saying which one) about 2 years ago, ran it for about 500 miles or so (weekend car, out of town ALOT) and swapped for an ATI. Based on the pics I have seen and looking at mine, I don't think what I have is an SLP Pulley though.

I'll post up some pics of the pulley that I have later.
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Old May 22, 2016 | 09:20 PM
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I have an SLP pulley on my car, it is both stamped SLP and has timing marks on it.
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Old May 25, 2016 | 01:22 AM
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Originally Posted by TimE
Shouldn't it have timing marks or a part number on it though? There is nothing on it anywhere. I was basing the comment about markings on the pic from vendors showing the SLP with timing marks. Here's a link to SLP's site... http://www.slponline.com/product/100...e-Pulley.html#

I know that a stock LS1 crank does not have a key way but I had read that the pulley did have a key way in it, hence the reason for that comment. Also Powerbond, that provides the SLP pulleys, have a key way cutout and timing marks.

I don't mean any disrespect but this just doesn't seem right to me. I contacted the individual that I purchased it from. He said he purchased the SLP UD from a board supporter (I'm not saying which one) about 2 years ago, ran it for about 500 miles or so (weekend car, out of town ALOT) and swapped for an ATI. Based on the pics I have seen and looking at mine, I don't think what I have is an SLP Pulley though.

I'll post up some pics of the pulley that I have later.
I have a Powerbond 25%UD on my car. Yes it has the markings, but No it does not have a keyway... And it isn't stamped with manufacture on it. And come to think of it the last time I took it off , I never aligned it. Lol

2001 T/A WS6 60K- Comp cams 218/224 , Harlandsharp RR, BBK 80mm TB, Pacesetter LTs/ 3" Y, SLP Lid /Maf/Lm1 exhaust,MSD wires with TR6s, and Powerbond 25%UD.
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