[KingCobra]

I have a question concerning the 460 internal Vs externally balanced engine and the harmonic balancer. I purchased a fluid damper from MustangSupply. This part is listed for use on an internally balanced engine #HBF 460. I know the Ford Morotrsport enginenes are externallly balanced and use a counter balanced flywheel and a counter balance weight on the front. Why cant this fluid damper work on the engine if it is balanced with the flywheel and counter weight. I can't seem to find a fluid balancer that is listed for the externally balanced engine????