engine

[maadams]

I have a Honda 400ex 2000. If I took my head in to the local machine shop and had it ported and polished, what kind of flow numbers should I shoot for and at what lift ? I have a wisco piston 86mm, 10:1, a hot cam stage 2 cam, white brother rev box, a double barrel ducan exhaust, the air box lid is removed, and a 172 main jet. I like to drag race in the sand and fast trail riding. What is the maxium compression ratio on pump gas and what kind of crank compression should I expect?

[dj416]

i've been looking for flow numbers on a ported 400 head for a while, nowbody seems to know. i wouldnt go over 10.8 or 11 with pump. mix 50/50 with 11-1 and it seems to work good