I have to buy some APC props, I have to see what the difference is compared to the props I am using. Those are good numbers for a 1 bbl engine you are getting. This first engine of yours is basically what I did to mine, except I have a Zama carb. I"ll try the APC prop next, but I also think I can make a low profile carb spacer to fit this Zama and I'll make a muffler also. By the way what is the altitude of your location, I think you are higher than Pennsylvania and you are still getting better numbers.