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

Early C4 cracking?

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Old Aug 17, 2006 | 08:17 PM
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Default Early C4 cracking?

Does anyone have pictures of the difference between the early and the late frames that demonstrate what GM did to fix the issue?
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Old Aug 17, 2006 | 08:20 PM
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what year?

I don't think the mods were to the frame, as much as they were to the components that were failing... more metal in the firewall, and more structure at the b-pillar.
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Old Aug 17, 2006 | 09:45 PM
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There were additional frame braces added. We've seen diagrams posted before, but the search sucks and I can't find them. Best I found was this thread referencing when the changes happened:

http://forums.corvetteforum.com/show...ighlight=frame
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Old Aug 17, 2006 | 10:10 PM
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I am referring to the b-pillar changes
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Old Aug 17, 2006 | 10:37 PM
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FWIW, on the Z51 chassis bracing, (theres a pic floating around showing the parts painted white) every base Corvette I've looked at had those as well, including two 86's.
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Old Aug 18, 2006 | 05:40 AM
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My 84 (non Z51) does not look like that.

The frame is only the black part on mine and the / \ bars only have one bolt at the rear.

The bar at the front does not have that much reinforcements to the frame and it is also not that thick.

Compare to this picture:


Last edited by JoBy; Aug 18, 2006 at 05:43 AM.
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Old Aug 18, 2006 | 07:53 AM
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Hang on a minute fellas... how would the Z51 bracing at the front of the car help with cracking at the b-pillar?
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