I'm a little confused, too. AFAIK, the intake we are talking about was designed for the Stage VI head to fit on an RB block so no spacers would be neccessary. Its the one used on their crate engines. This intake has been around for years and i actually always thought it was just an M1 w/an integral valley cover. Guess i never looked real close at it to see its actually differnt from an M1.

I could be wrong and someone(Zippy?) correct me if i am.