Ducman, its not just your cc's and timing you have to worry about, the squish clearance and squish band width must be matched to your cylinders at rated peak HP rpm in order for your squish velocity to fall into the right range. Re-cut off the shelf domes wont cut it...especially on hi-output designs on pump gas...Jim
heres some advice.
http://www.bansheehq.com/forums/index.php?showtopic=56778