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Anyone else experience this? When the car is idling you can see the middle of the fender at the wheel lip vibrating. I have the Heidts front clip, stock LS3 so it idles smooth, and they are GM fenders, everything is tight and fender braces are attached. I was thinking of putting a strip of dynamat behind the fender???
 

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Funny, I never had that problem running my 194 I6.

I have heard that, on some cars, certain parts of the car will develop cracks based on the vibration frequency of the engine or the car. It takes a long time for them to develop, but it can happen. I wonder if the vibration is at all speeds/RPM.
 

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Zonnie, I'm assuming you have aftermarket inner fenders since you have a Heidts clip. If so, do the aftermarket inners add as much structural support to the fenders as did the OEM's?
 

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Zonnie, I'm assuming you have aftermarket inner fenders since you have a Heidts clip. If so, do the aftermarket inners add as much structural support to the fenders as did the OEM's?
Well both the Heidts inner panels and the stock only attach at the top of the fender, neither attachs to the lower center
 

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Although my 65 isn’t running I wasn’t impressed with the inner fenders on the TCI kit and added this, I got the idea from another user. I just trimmed up the inner fenders and drilled a few holes to mount. It adds a lot of strength in my opinion and not outrageous in price.
 

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1969 Nova . . 2dr . . Chino Valley,Az USA
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Funny, I never had that problem running my 194 I6.


I wonder if the vibration is at all speeds/RPM.


not a bad idea --- Stick a Go - PRO on there , & take a look ?
 

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Both of my fenders had the vibration issues due to media blasting thinning them out. I did a fiberglass reinforcement behind them and now stiff as a board
 

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Is your inner fender attached to the tubular subframe and core support? I know the TCI inner fenders don’t come with any holes in the lower area to attach to the subframe.
 

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I have the TCI inner fenders which are attached to the core support and sub frame. I didn’t notice any fender movement until it was on the chassis dyno. Under full acceleration they both were wiggling a little bit.
 

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Discussion Starter #10
Is your inner fender attached to the tubular subframe and core support? I know the TCI inner fenders don’t come with any holes in the lower area to attach to the subframe.
They are attached to the heidts rails
 

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Discussion Starter #11
Although my 65 isn’t running I wasn’t impressed with the inner fenders on the TCI kit and added this, I got the idea from another user. I just trimmed up the inner fenders and drilled a few holes to mount. It adds a lot of strength in my opinion and not outrageous in price.
These look like they are for the upper fender, dont have a problem there
 
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