Yes sir gary. 27 is more than safe. I had mine drop to 25 at 8 psi for a long time to be safe. I have also run it locked at 30 with no issues. All depends on the carb and fuel.
Gary, Jake: What kind of compression are you guys running? Piston? I’m so intrigued by these pro chargers!!
I ran 32° locked with corn and 9lbs, it appeared to be very happy, never dynoed it but it was FAST ha, that was at 11.25 to 1