OK, stupid question time. I went to change the plugs yesterday and ended up getting plugs that were one range colder, since they discontinued the ones I was using. I asked what the gap should be, and the counter guy guessed and said 45, because my car wasn't in the computer. I thought that sounded excessive, since the old plugs were around 38, so I went with 40. Now the problem, the car went from nice and snappy, to fat and lazy. The motor is a high compression SBC, with an HEI distributor. Do I need to get hotter plugs, or is my gap incorrect? Chime in with opinions.