C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Setting L98 timing

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Old Oct 29, 2006 | 06:22 PM
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Default Setting L98 timing

I just purchased a timing light, because I suspect that the timing is off. I pulled out the shop manual, and found out that the timing is to be set a 6 degrees. The problem is that the timing marks, do not look like the one in the service manual. There is a large cut out, which I assume is 0 degrees. There are two notches below that and three above. Does anyont have a picture of one, or can tell me what I am looking at?
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Old Oct 29, 2006 | 08:27 PM
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You will have to disconnect the EST wire first before setting timing so the ECM can't retard the timing. The larger indention is 0*. Each notch over to the pass side is 2*. Loosen the distrubitor hold down bolt and move the distrubitor to set timing. Tighten the bolt and recheck. Here is a pic of the EST.

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Old Oct 29, 2006 | 11:24 PM
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I have a photo that should explain it well. The base timing is usually 6 degrees before TDC. The first v-notch left of the large zero notch viewed from the front of the engine.

Last edited by gtadudeoh; Oct 30, 2006 at 03:20 PM.
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Old Oct 30, 2006 | 12:23 AM
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Originally Posted by gtadudeoh
I have a photo that should explain it well. The base timing is usually 6 degrees before TDC. The first v-notch left of the large zero notch viewed from the front of the engine.
C:\Documents and Settings\Darrell Vincent\My Documents\My Pictures\engine rebuild\after\img_1237.jpg
But not much help unless we have access to your computer!

How 'bout this:
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Old Oct 30, 2006 | 10:07 AM
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With these good pics you should have no problem.
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Old Oct 31, 2006 | 08:09 PM
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Ray: good picture and I think I will save this for my use and others. Thanks for the photo
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Old Nov 3, 2006 | 08:04 AM
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Thank you very much for the pictures. Mine is covered in rusty brown, and I can't make anything of it. Thanks again!!!
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Old Nov 3, 2006 | 01:13 PM
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Did you get the timing where you want it?
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Old Nov 20, 2006 | 07:15 PM
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Old Nov 27, 2006 | 12:56 AM
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thanks for that picture, that explains alot, i just looked in this thread just incase, and I ended up learning something, this is a great forum.
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Old Dec 21, 2006 | 07:52 AM
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does that est unplug recommendation apply to all C4's?
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Old Dec 21, 2006 | 09:39 AM
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Originally Posted by Archaea
does that est unplug recommendation apply to all C4's?
All L98's, can't comment on the LTx's
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