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Flexplate for 408c with 4R70W?

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Installing the 4R70W on the 408C and the converter will not mate to my old C4 flexplate. Can anyone shed some light as to what flexplate I might need? Attaching pics of my existing one. Being that this is a stroker, can I use an off the shelf balance weighted one or will i need to get one custom done? Thanks in advance!







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The torque converter has to match the crankshaft balance on your stroker, internally balanced 0 ounce flexplate, or externally balanced 28 ounce or 50 ounce. Any off-the-shelf flexplate that matches your crankshaft balance and torque converter bolt pattern/diameter will work.



“If you can't explain it simply, you don't understand it well enough.”

--Albert Einstein


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