Jet sizing question

Abodybomber said
.64 jets, with a 6.5 power valve ,is different..

Why do you say it's different? It's the standard specs for the list #.

It's a list 80457, model 4160.

Thanks for the advice on 2 sizes, I didn't expect I would be doing it one size at a time, but I don't know.

Cheers,

Robert