So a buddy of mine with a 4 cyl 115 merc (early '90's carb'd engine on a Nitro) asks me if he can do any mods to his engine. I've only messed around modding V-6 2.0,2.5 and 3.0's. Is it even worth it? Can the head be shaved and a set of better reeds benefit him at all? so sad...I popped him in his forehead and said,"jeez, I could have had a V-6"