Did some googling, but I couldn't find a straight answer. I've torn down the motor, found I had a b303. I know alphabets aren't the greatest, but I'm sticking to a budget. I've got a set of gt40p's and I need rockers. Are 1.7's gonna cause ptv issues?
Measure your piston to valve clearance with the 1.6's, then figure out how much extra lift you will have with the 1.7's. That should give you an idea. Then, REMEASURE when/if you go to the 1.7's and confirm you have enough.