AK427cobragirl There is a big different between street driving and road course or auto cross. Street driving the motor would have lasted for years longer. Auto cross is brutal on the motor. If you have a couple of pictures. would like to see the bottom end or the end of the rod that broke. My guess is one of the back 4 rods. The rod end will be blue or blacken. This is the sign of no or low
oil pressure. The motor can't live without it when you are pulling high "G" turns. It sound like you where happy with the power of the motor. I wouldn't change this. How ever since we are going with a new motor, better parts would be in order.
The only thing I will say from 15+ years of just roadracing and autocross is 98% of the motors die from no oiling at times when running. A drysump setup for your next motor would be key or to add an accusump with a 3 quart tank. This will help keep your
oil pressure up even if the pump is loosing
oil from high "G" turns. HVHP oil pump to start and look for any oil modifications to help keep more oil around the crankshaft and rods. 80 psi system would also be recommended. Adding a low oil pressure light on the dash would help to telkl you if the oil pressure drops below 30 psi. You have 4 guys on this threads that all build motors and stand behind their products. Uping the power to another 20-40 ft of torque would be nice with a new motor, Forget about HP, you are not driving top speed at Maxon or Silverstone. You might want to look at going to a Run&Gun for 3-4 days of all the track and autocross you can handle. No Police or tickets either. Rick L.