High compression with aluminum heads and pump gas???????

71DodgeDemon340 said
How does he know nothing, i told him i wanted a strong street car to run on pump gas, and he suggested to stay around 10:1 comp, maybe he was just being on the conservative side, he suggested to shoot for 10:1 comp and not run a higher amount of comp.

I suspect you nailed it. If I was building engines for anyone who walked in the door and who might not understand engines and who I did not know for sure would take care of the tune for a high CR engine, I'd be conservative too. There is too much chance for someone to abuse it and not keep it tuned or put in regular/crappy gas, and then have detonation issues and come back and blame me. With the social media access for people to put out all sorts of nonsense and lies, you gotta be careful, and we ALL know guys who will beat the crap out of engines and then blame somebody/something else. My local machinist who has built gobs for race engines for the local circle and drag track in all classes, went conservative on me last week when I mentioned 10:1 CR. I'll listen to his input but move forward on my own judgement.

KrazyKuda's post is good 'cuz it ID's the edge of detonation for his setup, and under what conditions. That info is as important as what is working well. Some drivers will put the engine under difference loading and one who drives higher RPM's and does not lug it down will have more success with an aggressive CR combo than some other driver's.

One missing part of the info for folks new to all this is what can be done to solve a mild pinging/detonation situation; it is not always a lost cause if you stray over the line. It can be solved to varying degrees with less ignition timing, cam retard, higher RPM's (TC stall speed, rear gear, long shifting), cam changes, and tune changes. Catch it in time and correct things.