1.6 rockers ??
 

My car is an 88 gt with an f-cam.
Now what is the price difference betwen them both?
so the 1.7 r better then 1.6 ? what will work better with my cam? do u guys think ?
thanks for the help !!

I'd stick with the 1.6 rockers. If you want more lift, then you can always cam up.

Most aftermarket cams are designed for use with 1.6 rockers. 1.6 rockers appear to be the standard.

1.7 rockers were more for improving stock cam performance (or for use with the b-cam or Cobra cam). And as you know, P/V clearance could be more of an issue with the 1.7 rockers.