[1795]

I agree with Gary. If you are running it up to 6500 rpms on a regular basis, like a person would in a race car, then 500 miles is not out of line. Most racers are refreshing their engines every 2-3 years, and those engines probably have only a few hundred miles on them if that. People with deep pockets will refresh them every year and sometimes more than once per year. Running it that hard puts a lot of stress on the engine.

If you are only hitting 6500 rpms every now and then, it should last much longer.