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that sucks big time!!!
I will do another dyno day for sure will just be a few weeks apart and no other changes.
FYI I lost 1mpg average after doing the valves, how much increased airflow does that equate to? I stepped 6 valves to the next size up. They are a tight min spec but still in spec, I am sure the dealer would not of steped these vales. I replaced all the other shims with new ones and would of half stepped about 12 more. How much more increased flow is it 12 more valves opening .02mm... about 1.2mm of each of those valves coming off the seat sooner, increasing duration and max lift... Yes it would make a difference.
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