Originally Posted by cobalt327
Better than nothing I suppose, but not a 4-tube.
They gave more hp and tq than any of the four tubes with in a hundred bucks. Even the guy at jegs confirmed that unless you going with full length 600 headers these are with in one or 2 hp higher or lower of just about all the cheap headers on the market. They really out performed a lot of the cheap hooker and other four tube headers. But once you got into good flowing stainless headers they were out shined. With a sbc small runner work well but the big poncho like the flow. 1 5/8 inch primaries and 2 inch for the double is plenty big enough. The center cylinders dont fire right on top of each other so no real need for a bigger tube. I think its more for fit then anything else.
Since the two center ports are so close to each other headers dont actually fit well unless they have the pipes flatted to fit the ports. And with cheap 4 tubes they just weld em on and ship it when you look from the valve out you can see the pipe does not properly cover the ports if the pipes are circular.