OK, I received my edelbrock heads. I ordered them for a 340 and they are the open chamber heads. I also ordered Comp Cam ultra pro roller rockers which include the shaft. It was mentioned in an earlier post that I should have got the closed chamber heads instead. I was looking at an article in the March 2013 Mopar Muscle mag regarding cylinder heads. It states that the Magnum version (closed chamber) retrofits the rocker arrangement from the stock pedestal mount to a small-block Chevy stud mounted arrangement, for a vittually unlimited selection in aftermarker rockers??? So if I do get the Closed Chamber heads, am I to assume I will have to send the shaft mounted roller rockers back also? Maybe I should just run the open chamber heads? Will there really be that much of a difference?
