what kind of flow #s is everyone getting out of there cylinder heads and what size valves are you using ? are all of these heads screwed up from gm do any of them have a venturi left ?? please let me know what you know ?? and after you ported them what size was the runner ???? and one more question how small has any one got the combustion chambers??

fountain 333,

JimV would probably be a good resource for the info you seek. He knows a lot about how the GM heads flow and what to do to correct them for more air flow. He just left for the PRI Show down in Indy. I know he is at least one person who can help you.