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Originally Posted by Tom Vaught
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.
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I agree.
Quote:
Originally Posted by Tom Vaught
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?
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Flow at .600 is 349cfm, I don’t have .650 flow numbers.
Quote:
Originally Posted by Tom Vaught
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.
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I have no flow numbers for the intake\head combination. I did suggest we upgrade to a tunnel ram.
Quote:
Originally Posted by Tom Vaught
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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Keep in mind, the CNC port was supposed to flow much more.
Does anyone know what the as-cast flow numbers are for these heads?