Not Ranked
BTSAI,
I believe you're correct. 428's are externally balanced and all other FE's are internally balanced. But, 428's can be internally balanced when they're being rebuilt if you prefer (and if you have a machine shop that knows what they're doing). Balancing a 428 internally involves the machine shop drilling holes in one of the crank counterweights and adding "slugs" to get the balance right. If you have it internally balanced, then there's no need to use a 428 flywheel that incorporates the counter weight.
CJ
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