I was going through what I need to rebuild my 70hp merc and came across that there is two different style pistons for the 49cu in merc. One is a low dome and the other is a high dome. I believe the difference in the dome height is .10 not for sure tho. I'm going to buy wiseco pistons. I had good luck with them on dirt bikes so I trust them but they have the high dome and low dome piston for 1980 to 1983 70hp merc. Can anyone shead some light on this for me. Raising the compression would give it a little more bottom end but i'll have to run prem fuel and watch the timing on the motor. I'd like to know if any 70hp merc can run either piston basically the do's and don't on these pistons.