I'm interested in getting my cylinder rebored to a larger size like 150, 160, 170. If I got the local machine shop to do this would I need to get a steel sleeve to prevent overheating? anything else? I'm not too interested in paying at least 300 dollars for a BBR kit or other make when I could get rebored and a piston for under 150 dollars. Any knowledge/recommendations on this topic would be appreciated. Thanks guys.