My Comet was running 10.80's when it suddenly hiccuped and quit. We towed back to the pits and a quick thrash found that my phazeable rotor screws had come loose. I set the timing pointer to TDC and re-aimed the rotor to point at number one. Car fired right up. We went out and made a couple passes and now could only run 11.0. I pulled out the timing light and found the timing had gone from 33 to 28 degrees. The car ran fine the rest of the weekend and a laid down a consistent sting of 11.0 runs allowing my son to take 2nd in his 11.00 class leaving on a pro tree. Before the next race I reset the timing to 33 and it ran 10.80's. While I wouldn't want to back it off more than that, it would be pretty easy mark your distributor to go between 33 and 28. Jim