Hedman's Elite headers are made from heavy ... These had a nicely swept design, and except for the rare Max Wedge cast-iron headers, were about as good as it got in factory iron.

In speaking with the Hedman reps, I was informed that the display ... From Classic Reproductions These 2.25-inch outlet cast-iron manifolds are based on the factory ram-air/H.O. manifolds that ...

mid-length headers, and log-style cast-iron headers – all of which are supplied by Holley Performance. The engine being used to conduct this experiment is a 6.0L BluePrint small block crate engine.