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If my engine is externally balanced and I switch from a automatic to a 4 speed, do I have to balance the new flywheel or just bolt it on. My engine is out of an 89 with a ton of work done to it.
Not knowing what engine you are talking about.
I guess it is a 454?
2 choices, put another bbc stick flywheel on (I would use something similar, like another 89 flywheel) and go or (best choice)take the auto flywheel to a balance shop and have them balance your new stick to the autos weight.
But that is only good if the auto flywheel was balanced with the rotating assembly.
Hope this helps.
Terry