Yeah, my situation is that I'm not running the big block on my machine. I had originally intended to do the big block swap at the time I bought the bike last year. But I'm not sure I'm willing to give up my observed 70mpg average fuel economy. From what I've researched, doing the BB and pumper carb will likely drop me to 50ish. And for the longer rides I want to do, that's gonna be an issue. Staying with 250cc seems to make more sense for me personally.

 

I have the 351 and CVK jetted so I get from 60 to 70+ mpg commuting on my SM wheels.