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I have a copy of the volvo cam timing tool which is the same tool for all the volvo white engines. V40, 850/S/V70, and our 960/S/V/90.
Small movements of the cam often are used by tuners to optomize characteristics of a particular engine. That is one of the parameters a "dyno-tuner" has to play with.
If you have a tool to allow you to return to the basic factory setting I think you only have knowlege and fun to gain by trying it.
That said, I'll bet with the smoother idle you have less over-lap and the peak power will be reduced?????????????
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'96 965 with 16' wheels at 119K. Had '85 745 Turbo Diesel for 200K.
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