How Can I Tellthe Wear Of My Rotor Housing
 

I hve just striped down my old 13b engine out of my gen 3 rx7. It had covered 50,000 miles was running fine and had good compression. I have taken it out because I have a new street ported engine to go in.
by looking at my rotor housings they look in good condtion and their are no marks on the housings
what tools do I need to measure the wear of the housings exactly.