hi i know that there is a GSF project for px cylinder head. i've serched here and in project forum, but i can't understand deutch, so i didn't find nothing. i'm serching gsf kopf for polini 210, either 57mm hub and 60mm hub. can you please tell me the best head for this configuration? and, there is a commercial head (worb,sip,...) equal or similar to this? because i'm not sure that here i can make modification to original head, so it's possible is simple for me to buy a new modified head. thanks a lot