[ERA174]

Ragtime, Don’t assume your engine builder tuned for anything more than a full throttle dyno pull, which leaves a lot more tuning to be done. I had an engine built with a Holley four barrel carburetor by the same company you used and that’s all they did for me. Your carburetors are much more complex and time consuming to properly tune, I doubt they invested the time to do more than what was required for their needs. Running the engine in an excessively rich fuel state will cause increased wear! If you have someone in your area with experience in properly dyno tuning your Weber carburetors for the full RPM range, that’s your best solution. If you can’t afford to pay an experienced professional to do the job, it’s time to educate yourself. If you’re going it on your own, Kirk V and Gaz64 have given you a starting point. Good luck sorting this out.