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Discussion in 'Troubleshooting & Diagnosis' started by Fbomb, Jun 10, 2017.
What bell housing you running? Hows the pilot bushing look?
You said your lifters start clattering after it warms up? How's the oil pressure when that happens? The out of balance might be eating the mains and the more wear the worse the vibration. Read stories about balance jobs that were off.
My Camaro had a major vibration at 2500 rpm some years ago. Finally figured out it was the flywheel. Brand new Hayes billet that was like 50 grams out of whack. I'd guess your vibration at the higher 4000 rpm might be something else?
Did you have a flywheel for a 400 cubic inch small block instead of a 350
Pull your belts off and check it in the garage.
First guess: Flywheel.
Yup....check the bell housing alignment while you have the trans out. Make sure it is dialed in and the run-out in all planes is good.
I removed the transmission an clutch. I think its this weighted ring on the clutch, you can see the witness marks where its been sitting. I'm worried that if I put this pressure plate back in that ring is just going to move back there. To answer some of your questions the fly wheel is for a 350, I ran this motor for two years and it was always great! Ran it with the belts off still vibrated, re set the valves to only 1/2 turn ( surprisingly this seemed to quite it down a bit...). Pilot bushing is being replaced while I have it apart. Thanks for all your help, Any suggestions on a better quality reasonably priced clutch?
Vibration gone! I removed that weighted ring, installed a new pilot bushing and the car feels great, even the clutch pedal is smoother. I'll keep you all updated if I start having any clutch slippage.
Did you have to replace both? I am having the same issue. It's only just above idle. This is the 3rd motor I've had in it because of one thing or another. It runs great, has great oil pressure, and I've chased everything I could think of but still the vibration at 800-1500, It smooths out after that. I've had the wrong dampner on a internally balanced motor, and that shook like crazy at every RPM so I didn't think it would be the dampner.