components were all balanced at a machine shop 25 years ago. engine has been assembled and running but the damper has slipped about 10 degrees over the years. i read the article on 440Source web site about this and they seem to say any balancer will work as long as it is for a steel crank. If it has a 6pk balancer on it and it's been balanced then you need to replace it with another external balance balancer that is weighted the same. If it has a six pack balancer on it, then it is externally balanced. All the six pack rod motors were externally balanced from the factory and used a special balancer.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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