How Accurate is Camquest?

AdamR said

Remember Cam quest wont take in account for crappy machine work. I think its usually a little generous with its out put.

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This is true and I'm sure Desktop dyno is no better either.

Another thing neither take into account for is rotating mass. I'm building a new 360 and am using KB 107 pistons and Eagle I beam rods which are allot lighter than stock parts. By using these parts the rotating mass is only 10192 grams vs. 12432 grams stock. That's like only slinging 6 pistons and rods around instead of 8 so it'll have to spool up much faster and make more power. My machinist also said he should be able to internally balance it without adding Mallory metal because of the lighter parts.

I think their figures are only valid if your in a perfect world i.e. everything is perfectly machined and dyno tuned.