I am in the process of changing over to an F2 Procharger. I ran a D1SC before and during this change I decided to have the bearings and rings checked before it goes back together. I have 1500 miles on the motor. My engine builder told me the bearings looked great but the 4 inside cylinders got hot. He explained the rings were "burnt" or somethng to that effect. So that's cylinders 3,5 and 4,6. I asked about a possible lean condition and he said he didn't think so because the pistons did not indicate that. He said it looked like an overheated issue. It doesn't make sense for the outside to be OK and the inside cylinders to do that. What's up? I am running a 400 SBC Dart block with AFR heads and EFI. I never saw the car get hot.