i didn't get a whole engine 'cause i'm not a millionaire. it was much cheaper to get the head and fit it to a 4m. this way i don't have to get an engine inspection as well. i also thought about running two dizzy's, cuz i got three spares layin' round. if anybody has a 5m-ge head off an engine, could they measur the bore of the combustion cahmber please. or pics.