What type of heads are you talking about? You mentioned stock ratio being 1.6, which would mean that you are talking about Magnum heads. Going to 1.7 wont reduce your friction any that I can see but will cause some disastrous retainer to guide clearance on the valve end unless you go with a mild cam. Why dont you tell us what you are working on and what you intend to do with it so we can get some more details and in turn give more advice.
