Power loss. 318 Vs 340 manifolds

I do not like that manifold comparison.... They are using a hodgepodge of headers and manifolds....

They are comparing manifolds that will fit in an a-body with ones that won't.... Take the 340 manifold vs 318 manifold info with a grain of salt....

It would only be accurate if we had the numbers form 340 manifold vs 318 manifold for the same application.