96" to 103" or to 110"

[Hillside Motorcycle]

Biggest dollar value would be to bore to 107".

[Weyrider]

A properly assembled 103" will run nicely, but like others have said, "no replacement for displacement". I would consider a 110 kit. I have no issues with Andrews 57's, but if you are doing all this work cams are cheap, get the right cam for the build. Plus I don't know how you come up with 85CC heads when you don't know what bore size you re going to run. Bore, cams, chamber size all needs to be decided as a package.

What is your budget? 103" flat top money, with 124" desires?

103" to 107" flat top budget, no desire to put a 124 in my Streetbob. The temptation of a 65 year old body with an 18 year old brain would lead to disastrous consequences. The 85CC head statement is a basis to make all other calculations. I understand that every part has to mix well with the other parts. It was a starting point, maybe I ain't as smart as I think I am. You are right I need to get the info and recommendations from the man who is going to port the heads.