I've never and will never use a Chinese sfi damper, my buddy who owns the dyno we test on has had more then one failure on they dyno, one came apart and blew a hole right through the dyno sell door, pieces scattered throughout the shop which could have killed someone.
We do sell and have used a lot of the Professional Products street balancers with no issues other then the timing scale is not accurate (didn't realize this till recently, Thanks Rich), so use a timing light with an advance dial for setting total timing. For an sfi unit the Australian made Power Bond units have worked well for us with no issues to date, I've had way to many BHJ's spin the inertia ring, I like the ATI's also but just make sure you have the pulley bolts in place and tight even if you aren't running a pulley, I learned that one the hard way!! I acquired a new one in a trade deal years ago with no instructions, I loctited the small bolts in place but they all sheared off at 7000rpm on the dyno, we all ducked!!! but it dropped in the tray and just spun till it stopped.
I think the whole sfi deal is a scam, we use the chinese sfi flexplates in mild applications as a stock replacement part but anything making big power and requiring sfi gets a TCI flexplate.
Use to think sfi meant it was a good piece, not anymore!
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