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Originally Posted by 1bad66
It also matters what tranny you are running. My 69 351w has a 28oz balance, but when I put a t-5 behind it, I had to go with a 50oz. Had the same problem you did at 2100rpm, put a 50oz on the front and everything is smooth now.
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I'm not trying to through rocks here, but this makes no sense to me at all. The 28 oz or 50 oz ballance is how much the engine lacks being internally ballanced, so the wieght is added externally to finish getting the internals of the engine ballanced out. This has everything to do with the components the engine is built with. The transmission is nutral ballanced and should not matter.
To go to the T-5, did you change the flywheel to a 50 oz and then get the vibration? Then change the damper to the 50 oz to get rid of the vibration?
I am afraid your engine is not properly ballanced and at high rpm the damper may come unglued or worse the flywheel.