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the internal restrictions are nice, but we have no reasonable way to enforce it. anyone could protest and then we would have to do a tear down to inspect the heads and that can only be done accurately if we have templates and factory tolerance maps for every set of heads GM ever used.
to keep things somewhat under control we have two ideas. a displacement limit, 408 or 410 would be fair since 400's were available from the factory in both chevy and pontiac models, and there is some consideration of a compression limit. there seems to be a common use of 11:1 as a limit for "street" engines under a few sanctioning bodies.
we are still looking for a good way to enforce both of these limitations. without a fair method of enforcement, rules are worthless.
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