I emailed spec about their billet flywheel and whether it was balanced.. They emailed back and said it was bolt-on and matched to the factory "standard" weight and that the weight can be removed for zero balance or left on for external balance.. Sounded good so I ordered it..

Sure enough it had the weight, so put it in with a stage 2 and rebuilt 93 t56 and surprise, cars shakes like a washing machine now..

Should of known better than to go with the warm fuzzy the tech rep gave me but thought I would just pass on the lesson learned.. It is coming out to get match balanced with my old flywheel next week..

 

That's strange. My billet FW had the weight on it, and I never had a problem. But hey, things happen good luck with it.