I have a .28 engine and I had rebuilt it recently to get some carbon off the piston and then I ran it for it a few weeks. Then it sat for about 3 weeks with after run oil in it. Today I ran it and afterwards I then took the head button off to find that the piston and head where very rough as it had been it had been eating itself apart. I was wondering if this could be corrosion or something els? And does anybody think this problem can be fixed?

Thanks for your help
Ajkracing