450? Haha I’ve pulled 490 before, that’s how one of my engines got the nickname “hot head”. It’s sitting out in the garage with a hole burned through it’s piston, not from that same race though. But ideally you want a dark ring in the center of your flex, your picture looks like it has a shadow there. My header always ends up looking like your picture no matter what. I think my flex looked like that when I lost the aforementioned engine. So be careful.