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NEW EDELBROCK BIG BLOCK HEADS

Looks like they are open chamber? Why! Why don’t they give us a chamber that got a more efficient design similar to the sbf head later in the video.
 
Another head. Since they offer the other BB heads in both chambers, I would assume this one will too. Very vague video. How much cfm? Will stock style rockers work?
 
I did in fact watch the video. It says the combustion chambers are CNC machined, not that the runners are CNC ported. The picture looked just like my RPM heads with a minor port matching less than 1/4 inch into the port. To be sure I looked up the part number on their website and it confirms the ports are as cast.
 
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