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

timing 1990 L98 ?

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Old Oct 18, 2010 | 06:49 PM
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Default timing 1990 L98 ?

The book says the info is on a sticker under the hood , nope

I can't rember, think it was 8 degree BTDC
Anyone Know`for sure ? 1990 L98
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Old Oct 18, 2010 | 09:08 PM
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on my 91 it's 6*
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Old Oct 19, 2010 | 10:25 AM
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Originally Posted by Joe
The book says the info is on a sticker under the hood , nope

I can't rember, think it was 8 degree BTDC
Anyone Know`for sure ? 1990 L98
I think the sticker is on the radiator on the drivers side. Talks about emissions in general.
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Old Oct 19, 2010 | 07:38 PM
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On mine shows how to thread the serpentine belt
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Old Oct 19, 2010 | 08:02 PM
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Originally Posted by TPI BOY
on my 91 it's 6*
That should work !
90 and 91 are the same animal
Thank you very much , if we can get it running correctly we have a new old stock Paxton Super charger to install , made for a 90 or 91
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Old Oct 22, 2010 | 11:30 AM
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spent 1/2 the day trying to get this done , used 3 diffrent kinds of paint to mark the balancer mark , Dam , had #1 cylinder on the wrong side
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Old Oct 22, 2010 | 04:07 PM
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Originally Posted by Joe
Dam , had #1 cylinder on the wrong side
With that said,

Prior to setting the timing, did you disconnect the EST bypass?
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Old Oct 22, 2010 | 11:30 PM
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Here it is on the drivers side of the radiator on my 87



Says 6 deg BTDC and 0.035" plug gap
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Old Oct 25, 2010 | 03:32 PM
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My 90 L98 says 6* BTDC

You must unplug the EST as someone said.
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Old Oct 26, 2010 | 08:34 PM
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Originally Posted by MyFirst90coupe
My 90 L98 says 6* BTDC

You must unplug the EST as someone said.
Yup we did , can,t figure it out , getting very bad fuel milage , no codes , black smoke and back firing , out of real side pipes ,well I did find a vacum line off under the throttle body , black smoke seems to be gone but running like poop ! Might need new plugs now

No sticker on my 90
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Old Nov 25, 2010 | 11:16 AM
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I have a pictures of the stickers but I can't attach them to this reply. I will put them in my corvette pictures.
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