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I guess the question I'd want answered before I let anyone change valve timing is this: Do I want full power at high revs, or a stable idle. I've never driven a car with both. There are too many compromises that adjusting the variable timing can't solve (like tuning a stringed instrument to make a perfect chord for all 12 notes...maybe it's a reason they call fiddling with a car "tuning"). Until I know exactly what I'm giving up, no one changes my valve timing. That's why I want to see an "adjusted" engine on the dyno. We all have factory engines and we've seen the dyno graphs. I want to know what happened to HP and torque after the adjustment.
Maybe some of you have engines which are out of spec and need adjusting. But I'd darn well want to know WHY they are out of spec before adjusting it. I can't believe that we are all getting more or less random cam shaft alignments on our engines from the factory. That's one of the things that gave Detroit a bad rep back in the 1970s; modern manufacturing can't operate that way, and computers make the measurement and adjustment very easy to do.
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