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Old 01-01-2013, 04:14 PM
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496CHEVY3100 496CHEVY3100 is offline
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only the sb400 had a weight attached to flex plate /flywheel also had a larger harmonic balancer look on back side of balancer If it has metal removed approx 1 " wide 5 " long it is a 400 external balance requiring matched flywheel ,if not you can use pre 85 2flywheel with larger bolt circle offered in 2 tooth count with maching starter ,if i remember correct 168 has staggered mounting holes 153 are straight across some have 2 long bolt some 1 long 1short,. I know before someone replies 454 also had added weights external balance
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