One thing I don't see in the rules is any mention of pistons. What oversize and what compression?
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9.1.4.176: Compression is limited to 12:1

I agree the rules seem to be lacking in the engine area.
A 3L BMW 4v= 29mm SIR & 2700lbs minimum.
So a 1.8L Honda has the same SIR & minimum weight?
The WC TC like weight calculations must come into play at some point, or did I missing something?
In WC TC the Honda Civic weighs ~2400# and the Bimmers and Audis weigh ~2800-3000#