i ran a 65 shot with only running colder plugs. I had intake and exhaust. My motor did blow up a couple weeks ago. It had 120k on it. I have a friend that also has an ls motor and he is running a 75 shot and seems to be fine. He has intake and exhaust. He only ran colder plugs too. He didnt retard his timing or anything. He wanted to blow his motor bc he has a new one so he ran hotter plugs for a while and nothing happened. With the nitrous and slicks he ran a 14.6 or 14.8 at bandemiere in colorado.