Edelbrock heads and Speedmaster heads are and have always been built for the street, street strip guys which is smart. They want to pull off their stock exhaust and install them and easily bolt a header on. W2 heads wisely moved the bolt holes out so they had more room to shape a port. But how many sets of used W2 headers do you see out there. I would like to talk to this know it all and have him explain how I can run 9.30’s with Edelbrock heads maybe 9.20’s with Edelbrock heads. It’s not all about flow numbers on the exhaust side.