I believe hughes stated on the website when these heads were offered is that thry were 179 cc runner and 62 c.c. combustion chamber. Just trying to get actual numbers because I'm just guessing at this point. Trying too see whats the biggest cam I can go to while keeping these heads and actually make power.
To answer ko swinger. They seem to be good, but I'm trying to figure out if these heads will support a cam around 250/254 duration, 603/608 lift.
