going from 1.6 rockers to 1.7

[jim_howard_pdx]

If your 1.6 rockers are netting say .480 lift, you can determine the actual lobe lift by dividing .480 by 1.6. Take this number and multiply it by 1.7. This will give you your new lift.

Did you measure the piston to valve clearance when you put the engine together? Are you running aftermarket heads? If so, you could punch the valve, or if they float in the future because the valve springs go soft, you will bend the valve and possibly ruin a head or engine.

Be careful is all I am saying.....

I measured my piston to valve clearance without the head gasket. Intake clearance was .17. Exhaust clearance was .29. I only require 0.08 clearance. My gasket compressed thickness is .039, so I am way safe. Going to 1.7's will be no problem.

Plan on picking up 8-15 hp. Also, do not expect more than a tenth second.