Depends on what you mean by “about the same”.

The best stock 906 I’ve tested was 20-25cfm better than the best stock X head I’ve tested.

Without looking through my notes, I’d say around 10-15cfm difference would be typical between a 906 and an X.




68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads