If I knew I would tell you
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But I don't
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Maybe one of the machine shops or machinest can come up with that information
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If not try E mailing Kieth Black and ask them
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I've bought a bunch of thier early hemi crankshaft adapter rings to use late model torque converters on the early top fueler stroker cranks like your wanting to use
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Do you have a late model B, RB or 426 Hemi crank to use to measure off of? I can provide the late model crank flange thickness if you need that
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The part I would worry about is the distance from the back of the motor to the flywheel flange distance
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