Quote:
Originally Posted by tnova
The right muffler bracket broke twice on my '91. Now I'm rebuilding the engine (160k miles-oil consumption and the need for more power) and found one of the motor mounts was broken. But for your post I would not have correlated the two. Thanks.
Tnova-'91 ZR1
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Yes I suspected that excessive movement of the motor was causing a flexing of the muffler sheetmetal where the muffler's rear mounting stud is attached. Ultimately, it rips the sheetmetal. The motor mount on the driver's side was cracked, and it was the corresponding muffler mount that failed.