QUOTE(dagger350 @ Apr 26 2009, 10:49 AM)

Any update on how the bike runs?
I have dyno time set for 3:30pm today..... but he it is.... 470cc BB/ Stroker 15.1 ish compression....

As far as who if he will beat you with a BB motor Z... it really depends on how he builds it. This one used to just be the Athena BB 434cc and would beat most bolt on 450's yfz,450r didn't matter.... but it was built right.... now a normal bolt on Athena 434cc kit on a Z motor I doubt would beat your 450r.... but it just depends on how well the parts are matched... like every build. Her (yes... her.... it's a chicks Z470cc

) when it was a 434cc all BB had a 14.25 Venom piston in it and some other goodies and it made 49hp/34tq.... so very respectable for a 434cc motor.
Thumper Racing makes a 463cc (they call it a 470cc kit) all BB 97mm bore and let me tell you we have a green one of those and it will put a spanking on some one if they aren't carefull..... so also it depends on what size BB kit he gets. Most people get the Athena kits which are 94mm pistons.