The Stovebolt Site Forums The Shop Area Engine Shop GM split exhaust manifold - facts or fiction

Could you elaborate on how these tests were performed? When I hook a ½” garden hose to the tap on the front of my house and a 2” fire hose on the one in the back they both flow the same. Why? Because the flowrate is determined by the size of the valve and it’s surrounding geometry. IMO the GM dual manifold (or reasonable facsimile) is more than adequate to keep up with this head’s ability (or lack of it) to expel exhaust but am open to being proven wrong.