Cam for a pentora 250

[J0SH122]

So I’ve been looking everywhere for a cam for my pentora 250 but cant seem to find anything on it.I’m trying to put a cam on it because I’m trying to squeeze out some extra horses out of it.The main reason I cant find anything because mine is a over head cam or ohc and most Chinese 250 are push rod.If anybody know anything please let me know where I can buy a cam for it

Thanks