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

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Old Sep 18, 2015 | 05:26 PM
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My 1989 has Bilstein shocks on it. I have no idea what shocks came on the car, if these were what the factory chose, or if they were changed out by a previous owner. I know the car should have a pretty stiff ride to it, but if I hit a bump in a corner, the car jumps sideways. I'm sure shocks have come a long way from when these were put on the car. What is the current state of the art for a car of my vintage?

Bill
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Old Sep 18, 2015 | 06:30 PM
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Originally Posted by TnEBill
My 1989 has Bilstein shocks on it. I have no idea what shocks came on the car, if these were what the factory chose, or if they were changed out by a previous owner. I know the car should have a pretty stiff ride to it, but if I hit a bump in a corner, the car jumps sideways. I'm sure shocks have come a long way from when these were put on the car. What is the current state of the art for a car of my vintage?

Bill
If you would like to ID what you have presently there should be information on the shock-tube body that ID's the build. From that information it could be determined as to whether they're OE or perhaps a Bilstein (other than OE) added to the car.

3 digit RPO's from the console label could ID the original build. The codes with FXX & ZXX would be the more interesting to check. XX being potentially a letter & number or numbers only.

Last edited by WVZR-1; Sep 18, 2015 at 06:37 PM.
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Old Sep 18, 2015 | 06:34 PM
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Originally Posted by TnEBill
My 1989 has Bilstein shocks on it. I have no idea what shocks came on the car, if these were what the factory chose, or if they were changed out by a previous owner. I know the car should have a pretty stiff ride to it, but if I hit a bump in a corner, the car jumps sideways. I'm sure shocks have come a long way from when these were put on the car. What is the current state of the art for a car of my vintage?

Bill
Bilstein is the original shock from the factory. Purists will only use the original part on their cars but you don't have to. There are other options but a lot depends on how you drive the car and what type of ride you want. They are easy to replace and you can do it yourself but may not fix your problem. If the front end is original you could need bearings, tie rod ends or bushings. Jack her up , grab the tire and try to shake it from 3 o'clock to 9 o'clock then 12 o clock to 6 oclock. Look for play I'n the suspension. Anything that moves is suspect and may need replace or rebuild. If the suspension does not move but you still have play then it's probably the bearings.
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Old Sep 18, 2015 | 10:08 PM
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Correct me if I am wrong but aren't Bilstein's warrantied for life and rebuildable? I replaced my Bilsteins after I read this. I still my original 88 Bilsteins though.
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Old Sep 18, 2015 | 11:11 PM
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I think you are correct but you need to be original owner with proof of purchase. Please correct me if I'm wrong because I just replaced the four on my 90 vert and still have them. Might have just blown $380.



Originally Posted by HAD2HAV2
Correct me if I am wrong but aren't Bilstein's warrantied for life and rebuildable? I replaced my Bilsteins after I read this. I still my original 88 Bilsteins though.
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Old Sep 18, 2015 | 11:51 PM
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Originally Posted by Dakotaz
I think you are correct but you need to be original owner with proof of purchase. Please correct me if I'm wrong because I just replaced the four on my 90 vert and still have them. Might have just blown $380.
I think you're right, me too. I replaced with Eldebrock shocks.
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Old Sep 19, 2015 | 12:56 PM
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Originally Posted by HAD2HAV2
aren't Bilstein's warrantied for life and rebuildable?
As second owner, I paid for the rebuild to Challenge Spec and could not be happier with the ride/handling in my Z51 car.

Jumping sideways? Is that in a corner while hitting a bump?
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Old Sep 19, 2015 | 01:49 PM
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Changed my old bilsteins for new ones.
I couldn't believe how Easy it was!!!
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Old Sep 22, 2015 | 06:59 AM
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Originally Posted by HAD2HAV2
I think you're right, me too. I replaced with Eldebrock shocks.
Do you have the part #'s for those Edelbrock shocks?
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Old Sep 22, 2015 | 07:05 AM
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Originally Posted by TnEBill
Do you have the part #'s for those Edelbrock shocks?
Buy parts that have recommended applications from vendors/manufacturer for your MODEL YEAR car. Don't rely upon what others have used for accuracy regarding applications.
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Old Sep 22, 2015 | 07:19 AM
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Originally Posted by WVZR-1
Buy parts that have recommended applications from vendors/manufacturer for your MODEL YEAR car. Don't rely upon what others have used for accuracy regarding applications.
That's the problem, I can't find anywhere on the Edelbrock site where they even make shocks, let alone for a Corvette... Eckler's has Edelbrock shocks, but only a short blurb about them. I'd like more detailed info on ride, valving, etc. And now I just noticed that they are "discontinued"... So who makes a similar shock? Did someone take over their "patented Inertia Active System"?

Last edited by TnEBill; Sep 22, 2015 at 07:23 AM.
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Old Sep 22, 2015 | 07:26 AM
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Originally Posted by TnEBill
That's the problem, I can't find anywhere on the Edelbrock site where they even make shocks, let alone for a Corvette... Eckler's has Edelbrock shocks, but only a short blurb about them. I'd like more detailed info on ride, valving, etc. And now I just noticed that they are "discontinued"... So who makes a similar shock? Did someone take over their "patented Inertia Active System"?
Edelbrock I don't believe has sold shocks for quite some time. Why would you be interested in purchasing a product that regardless of the vendor purchased from they can't offer support?
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Old Sep 22, 2015 | 07:41 AM
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Originally Posted by WVZR-1
Edelbrock I don't believe has sold shocks for quite some time. Why would you be interested in purchasing a product that regardless of the vendor purchased from they can't offer support?
So sorry for the confusion. I thought I asked, "who makes a similar shock?"
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Old Sep 22, 2015 | 08:09 AM
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Originally Posted by TnEBill
So sorry for the confusion. I thought I asked, "who makes a similar shock?"
Originally Posted by TnEBill
And now I just noticed that they are "discontinued"... So who makes a similar shock? Did someone take over their "patented Inertia Active System"?


No confusion. I was looking at your post #11 before you "added" this comment and when I clicked on the reply it picked up of course the NEW entry with the edit.
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Old Sep 23, 2015 | 01:28 AM
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Originally Posted by TnEBill
So sorry for the confusion. I thought I asked, "who makes a similar shock?"
Bilstein makes shocks.
Koni makes shocks
QA1 makes shocks

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