Ok I searched and came up w/ nothing really pertaining to my current problem. I have a 94 6 speed 383 stroker camaro. Recently I destroyed my clutch/flywheel so I had these replaced.
Upon inspection of the flywheel, the machine shop that built the engine drilled a bunch of holes in the flywheel to balance it....didn't seem normal but this is my first time doing this stuff.

Well my mechanic replaced the clutch and flywheel w/ a Ram clutch and a billet flywheel. The problem now is that the car vibrates like crazy anywhere around 3000rpm. Apparently the shop balanced the engine off of this drilled flywheel.

My mechanic informed me that he thinks he can fix this vibration by purchasing a correct harmonic balancer for a 383 camaro. This sound like it will work? Also anyone know what size these balancers are? I am finding anything from 6" to 8" for these balancers...

The problem is my mechanic has very little if any free time. I am afraid to drive the car cause the vibration is pretty ridiculous. Do I somehow need to match the weight of the current flywheel to my old drilled one??

Anyone have any ideas for me? I have an aluminum driveshaft on the way but doubt this has anything to do w/ my stock steel driveshaft.

Input please...not driving this car is killing me!
Thanks

 

Was your 383 stroker balanced "internally" or "externally"?

In any case, its not the harmonic damper (there is no "harmonic balancer" on an LT1), at least not if they used the correct LT1 damper when they rebuilt the engine. The LT1 is neutral balanced on the front - damper has no balance weight on it. Stock engine is externally balanced in the rear with a large weight on the flywheel. If your engine was internally balance when the stroker was built, you need a flywheel without the balance weight. If it was rebuilt externally balanced, you need a flywheel with the balance weight.

How was it balanced, and does your new flywheel have a weight on it? Did the old "swiss cheese" flywheel have a weight on it?

 

from the first post it sounds like the engine builder corrected balance with reduced weight from drilling the flywheel - not the best strategy for flywheel swaps down the road. Called "external balanced".

solution? If you can talk to the builder perhaps they kept a record of the balance.

I'm in the same boat with a vibration, don't know the builder. I have an aftermarket flywheel with the "external balance" weight. I think it needs to be "internal balance" without the weight.

If I was in your shoes, I'd see if a shop could duplicate the flywheel you took off as far as balance. Good luck.

 

Thanks for the responses! The engine was built in Kentucky....and I live in IL..so getting to that shop poses a problem. However I still have the stock flywheel so I will attempt to somehow match that. Either way it seems that the tranny needs to be dropped once again...
Thanks again