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To the best of my knowledge the flywheel I posted the picture of came off a 454, at least that's what I was told when I bought it.
I put over 10,000 miles on the 400 sbc it was bolted to.
Tomorrow...

This is a picture of the one I have.

On the one I have it's an extension of the counterweight on the 283.

I would assume that what you listed from ebay would work and it would be less expensive.

[QUOTE=Gusaroo]Guys, please school me, I wondered about this as well.

Common sense to me says that "externally balanced" means there is weight either added or removed to the flywheel to balance...

When I get the chance I will take a picture of the 454 flywheel that I have in the garage. It was bolted to a stock 400 sbc, which I also still have, and I never had a bit of a problem with it.

Pat, on this I respectfully disagree. To my knowledge GM put only turbo 400's behind sbc 400's. Also these are the only two engines which are externally balanced and a flywheel from a 454 will work...