Were the vacume readings steady or was the needle bouncin? Have you verified what size power valve is in the carb? Do you know how to check for vacume leak??
The needle was bouncing around during the vacuum test. Not severely, but it wasn’t perfectly steady. I’m not sure what power valve is in the carb. It’s only a few months old, so whatever Holley is putting in new 4160s off the shelf. The way I checked for a leak was to spray carb cleaner all around the intake and base of the carb looking for a change in rpm.
