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You may increase to 1.7 ratio rockers, but you need to verify the valve train geometry. This may cause you to adjust the pushrod length. Even with the 1.6 rockers, your should check the valvetrain geometry. You will probably make a more noticible power increase by adding 1.6 rockers to the exhaust side only. Many engine builders mix different rocker ratios to acheive a consistent power out of each cylinder. Since the outside cylinders are a longer overall distance, some will increase rocker ratios on the outside cylinders only and then increase just the exhaust rockers on the inside cylinders. You may need to experiment to acheive the best power balance. When you changed to 1.6 rockers, you will increase overall valve lift without increasing duration and the same goes for the increase to the 1.7 rockers.