jW transmissions has a KILLA flex plate called THE WHEEL.
Chrome plated and super strong and ultra lightweight, even SFI rated. It will last you Centuries, too.
99 plus the ride.
It is the only flexplate I use.
Check it out on their website.
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Dont forget, a 360 is externally balanced, so you must get weights installed on your Torque Converter. Any competent trans shop can do this.
Dont let them talk u into putting the weights on the Flexplate....YOU'LL BE SORRY, if u do.