Disappointing dyno results

The way your carb is running rich would only give a 3% horsepower loss. I’m thinking that the secondaries air door needs adjustment. The vacuum pot needs to be adjusted to open easier and quicker. Since your dyno guy has no jets and rods, he may not have experience with carter carbs. In high performance applications, mostly after market, a holley is used as much as all other brands combined together.

But I’m still at compression is not high enough.