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External Balance will have an offset weight to compensate for (balance) the rotating assembly... If the engine has a forged crank typically there is enough weight in the counter weights to internally balance the engine.. On a cast crank the material is less dense so it doesn't weigh enough to compensate for the pistons & rods... The cgoices become lighter pistons & rods ($$$$) Mallory (very heavy) metal slugs in the crank ($$$) or a damper and flywheel/flexplate with offset weights... A 73 should have a cast crank... BTW this picture shows a externally balanced 440 damper... (Thanks Brandon!)



that is not 440 one is a 1972 Shown above is damper #3614374, used on 400's with external balance cast cranks one this a 70-71 440 hp Even though these dampers have an elliptical weight, they were never used with any cast cranks. These dampers were used with steel cranks and "six pack" (2951908 casting #) rods.one

Last edited by plymouth birdman; 08/02/09 11:03 PM.
Plymouth's gonna getcha! There are 3 things that will live forever, cockroaches, Keith Richards, & slant 6 Dusters 71 gtx 440 4speed air grabber blue on blue with white vinyl roof