Ok, maybe that is a little dramatic but I put the hammer down and I immediately hear it. I know about additives. I know about octane boost and think it is a marketing ploy at best. The highest octane im seeing is 97 so what do I do to quelch this detonation on a stock engine? I'm interested in hearing everything from snake oil remedies to the meat and potatoes stuff. Engine is a 65 390/4v with the expected compression.