my appologies. those pictures were of a US version. mine is a euro. i think the pistons are domed. i guess i will only know what room i have to work with when i take it apart and DO IT!

just want to know your opinion on my theory though. if i had to use the bigger exhaust valves and retard the exhaust cam timing by 2 degrees. will i lose the overlap? the only way i see the bigger exhaust valves being of benefit is a better scavenge effect with the cam overlap. but i have to retard the exhaust cam timing or else im going to be wasting gas at low speeds. is 2 degrees retard on the exhaust cam enough to lose the overlap effect? but then im just going to push the power band a tiny bit higher. agh to heck with it. might as well just work on a blower