Interesting information by Brent and JoyRidin. It makes me feel better about my 366RWHP on a mustang dyno. The intake rocker studs wicking
oil into the runners [ made a mess of the valves had to take them apart and clean them ] and no tune. What I got out of the session was I have a nice broad TQ curve. My desktop dyno with every detail punched in from the Heads, Cam, Intake, Exhaust etc. was 494FWHP. With the info in this thread it makes more sense to me now.