Hi Tech, I just measured them and they do have 76cc chambers, valves are 1,92"/1,50". I'll do the runners tomorrow. These heads seem to be quite scarce, mortec says they're good for making HP, but what I really want is torque in my 5000 lbs van. But first it's off to the magnafluxing for them...
Didn't know they were so rare, otherwise I would have measured them right away myself. Thanks for the article!