Breaking in motor now. Temps got up to around 240-260 for a short time. Using heat cycle on box for first 15 min with 3-5 min cycles. What are the ill affects if temp went up for a short time during break in? Engine was preheated with gun to 190 or so for each start. I know some guys at the track run there motors at a max of 260. Been told about 240 is ideal.