Thanks for the feedback guys. I was figuring the intake may be a restriction, but I never guessed by this much. I will say this, I know this dyno is conservative. FWIW - The last engine I did on this dyno (493, indy-1's 13-1, solid roller, dominator) also had numbers on the low side compared to other combos here on Moparts.

Topbrent - I know about your combo and as a matter of fact, that is the combo that I had in my mind when I thought somthing was seriously wrong with my dyno numbers. I didn't expect to make 650/650, but I figured it would be at least 600/600. Maybe I should try a Victor for comparison?