833 hold up to 500hp RB

Must have hit a nerve.

So did you balance your rotating assembly the way Centerforce says to? Which is to remove the centrifugal weights and then balance. I have. Then I put the weight back on. It was out of balance, and it changed every time I stopped the balancer and then started it again. So yes, your stuff is out of balance, regardless of what Centerforce says. I have talked to them on the phone with a crank on the balancer.

Obviously, you don't pay attention. I said the Borg&Beck/LONG cover. You must have missed that. Not the Borg&Beck cover.

You can be antagonistic or maybe you can learn something. My current car is a high 11 second daily driver. With a sintered iron clutch. I don't break parts. It's really simple.

EDIT: where did I say anything about 1500 hp or ProStock? You embellish things much?

EDIT 2: I have run synthetic gear oil in stock 833's since the early 1980's. They were all stock. Just because YOU can't do something doesn't mean I can't.

Well, it seems like you hit a ''nerve'' with most of the responders to this thread, not just me.
And i feel that we struck a ''nerve'' with you judging by your harsh responses.
Portraying yourself as a know it all for clutch design and what materials and technology works, and for that matter, what doesn't work on ALL applications makes you a self professed expert on the subject.
Naturally, many would draw the inference that if you have the vast experience that you are portraying on here with your posts, running 9 second stick cars in the past and all, that you would be up to snuff with the higher end racers who run Pro Stock etc. who demand the latest in technology mixed with the experience of a ''been there done that and it didn't work, but i do know what does for every application'' person like you.
FWIW, i still stick by the fact that my engine does not vibrate at over 6,000 rpm with my new Centerforce clutch, so i am certain that the balance to the engine wasn't changed much at all in my application, if any.
Also, what brand and weight of synthetic oil do you run in your transmission?
I ran Amsoil 75/90 in mine and couldn't get it to work without clashing. I even checked that the clutch was fully disengaging, so that wasn't the issue. A flush and change back to 75/90 GL4 solved the issue completely.
This is sad, because i believe in the great benefits of using synthetic oils.

My apologies for the O.P., it seems we got side tracked on what was a reasonably simple question.