I just broke in a new piston sleeve combo and doing heat cycle method. The only thing I did this time compared to times in the past was I added a shim to the head button to reduce the compression for about 1/2 gallon of idle time. As I was getting closer to start to run the car I took the extra shim out and idled 2 tanks and then began the figure 8 heat cycling. This was probably the best break-in I have ever done.