Edelbrock LD-340 Shallow Port Match​

Test note:This was the best 4BBL intake for small-block Mopars for many years. This particular manifold (borrowed for testing) had a port match that was only -inch deep. The flow is impressive for an ancient dual-plane, but the flow bench does not always tell the entire story.​

Edelbrock RPM​

Test note:This intake has an excellent and well-deserved reputation and has taken the place of the LD-340. This is one of those cases where the flow bench does not tell the whole story. This manifold did not flow as much as the LD-340, but it will produce more power. Why? Look at the manifold intake runners. Notice how the port shape and runner arrangement has changed from the older LD-340 to the RPM. The runner lengths are shorter and the cross-sectional areas are more consistent from the plenum to the head. Lots of flow work and testing went into the newer intake design which paid off in horsepower.​