[blykins]

Since you edited yours, I'll edit mine....

I agree with your general statement of how rotational momentum works.

I don't agree with the general statement that a SBF will "rev quicker" than an FE or BBF. Too many variables and I've been around too many big blocks to know better.

It also does depend on the bobweight, and the bobweight isn't just used for balancing. The bobweight consists of the rod weight, the piston weight, the ring weight, the wrist pin weight, etc, etc. The lighter the bob, the less weight you have hanging off of each rod journal.

However, the statement that was made, unless qualified specifically, is wrong.