1) Some rockers rarely achieve a true 1.65 Rocker Ratio. I do not believe that your installed stud roller rockers will achieve 1.65 Rocker Ratio.
2) You don't really have .701 lift as you have the lash to subtract and some pushrod deflection in the system. Lets say that you have an honest lift closer to .650 lift. What is your head flow at that checking point?
3) Did they give you numbers for the intake system (intake and head) vs just a head number? Typical low rise intakes (not tunnel rams) also cause some flow loss.
You made 660 hp. That would imply that you had an actual system flow around 330/340 cfm vs your assumed 367 cfm head. Hard to make 750 hp with a 330/340 head Naturally Aspirated Ed. The event timing on the camshaft is not conducive to making big NA power with only 25 degrees of overlap.
Tom Vaught
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"Engineers do stuff for reasons" Tom Vaught
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