Hey guys, new here but am doing exactly what is outlined in this post. I have an 03 Classic 1600, I did the reed valves, PCIII, Pipes, thunder air kit etc.
so I did an assload of research and I can tell you that they are geared different but it's in the tranny not the final drive. Cams are the same (same part #), valves are larger as is the thrittle body and the injectors.
Here is the plan. I got my hands on the complete top end front and rear for an 04 meanie, I am ordering the thunder mfg big bore kit as well. I am pulling the engine on friday night, I will swap the meanie parts in when I do the big bore kit and I am also having the heads ported. Once I'm done I will dyno tune and we'll all know if this is effective.