A higher compression engine should have a colder spark plug. The engineers explain that it has to do with flame temperature and overheating the plug. I know from experience that my race engine will melt a street plug. Choose from the following NGK plugs:
Cold Street = BP7ES
Colder Street = BP8ES
Cold Race = BP9EV
Coldest Race = BP10EV
For recessed nose plug see B8ES.