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I`ll take a stab and say with any 1 piece rear main setup it should require a weighted flywheel and there for needs an external balance...? The 2 piece rear main type cranks have some weighting on the flywheel flange so SOME do not need an external weight (454`s and larger do)...
But as a 1 piece rear main 350 (87 and later) requires a weighted flywheel (not the same as the 400 weighted flywheel) then a BBC of the same config should also need this for proper balance...
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