Never noticed before, but I was chasing out the threads on this head I just finished porting; There are FOUR tapped holes on the intake side?
Only two used.

Anyone know why? I can't see them being used for tooling or fixtures during machining but they HAVE to have a purpose or they wouldn't waste machine time D&Ting them.
Got my intake and sure enough they are covered by the factory intake and not used on the 200ES. I have an ATC200, 200E, 200ES and a 200S. All the same. Is there something on a different model that use them by chance?