C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
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'68 Engine build thread with 5 speed

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Old Oct 3, 2021 | 01:34 PM
  #61  
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Nice job
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Old Oct 3, 2021 | 08:13 PM
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The car runs great as far as the engine but at about 35 mph I get a really bad vibration from somewhere.

I thought maybe under inflated tires but adding air did not fix it. Then I thought maybe flat spots on the tires from sitting for 6 months but I seem to hear a clunk in the back end.

Im going to put it up on the lift and see what I can find. Any ideas?
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Old Oct 3, 2021 | 09:06 PM
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You said you got the Mcloud clutch setup. Did you get the right flywheel for your motor? Did you have them balance it?
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Old Oct 3, 2021 | 10:08 PM
  #64  
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So I figured it out. At some point I must have loosened the rear ujoint at the driveshaft even though I dont remember doing so. So the drive shaft was rattling around and then it threw an end cap. I bought a new u-joint and replaced the cap so I think it is good now. Ill take it for a drive in a few minutes and see.
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Old Oct 3, 2021 | 10:50 PM
  #65  
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Was your issue fixed?
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Old Oct 3, 2021 | 10:52 PM
  #66  
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Yes, the vibration is gone
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Old Nov 2, 2021 | 01:36 PM
  #67  
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The car is all dialed in and I swapped the glasspacks side pipe inserts for a set of 2-1/2” Sweet Thunder inserts and the car is just nasty. She is fast, drives nice and looks real good. This car has become everything I wanted it to be.
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Old Nov 3, 2021 | 12:17 AM
  #68  
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Fantaatic! Awaiting final pictures and maybe a video too! Congratulations after all your hard work! Enjoy her!
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