Eric, what are you basing the 5K limit on?? I know of several guys running slightly worked oval port heads (closed chamber at that) that are pulling an easy 6500 rpms, and running deep in the 10's with their combo. I know with the heads Im proposing, Im not gonna pull to 7K, but then again, I dont have to. And for the record, Im going to look at those eddys that you mentioned, but I doubt they're going to be in the budget. Thanks for the link though! John