1.6 vs. 1.7 rocker ratio
 

Aside from the obvious change in lift, what about duration? Does it change at .05? Does the advertised duration change as well as the seat timing? Any camshaft techies please feel free to respond.

Only lift changes.

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1988 Mustang GT
11.8 @ 123 (7/14/01)
1992 BadAzz Wrangler
1993 Explorer

See my car at: www.mustangworks.com/cgi-bin/moi-display.cgi?179

I agree with that.

It's a rocker ratio, meaning you are multiplying the gross cam lift. 0 lift multiplied on the 1.6's is 0 lift. 0 multiplied by 1.7 is still 0 lift.