Somebody like Jesus himself worked your X heads or somebody really messed up your W2's. I mean every set I have ever seen went 231 cfm out of the box-but the potential is incredible. J.Rob
p.s. Sorry for the hijack.
Concerning the bore thing-yes thicker is better especially in this case. Often people ask for a large overbore and they think .030" is the ****--Until I get my calipers and open it to .015" hold it up and show them what .015" per side looks like. Usually changes their tune. J.Rob