Hey guys,
just some info for anyone that wants it, I fitted a set of Pro Topline chev heads 64cc chambers 23 deg units with 200 runners, firstly fantastic perforance difference. Down side but no bigdeal they dont perfectly match up to intake manifolds, there is a slight gap into the valley area of the engine, behind the front water passage bolts,on hard revs oil droplets spray out onto the engine . No big deal a slop of silastic and thats fixed, the other downside is the plugs angle downwards at an exact 90 deg to the chamber makes fitting spark plugs and exhausts little bit tricky. But all in all fantastic units
Steve