[CSX 4027]

Sidewinder was a 67 part so was never delivered on a 65 Cobra. The 427 S/C and Comp Cars were delivered with a single 4 straight up medium riser manifold that was made of Magnesium. The aluminum was used as a replacement and supplement since you could not use anti-freeze in Magnesium. Few survive. The sidewinder was a buzzword and limited to circle track racing, hence the term and the application. A waste on the street or for road racing. Why would you want longer runners to one side of the engine if you ar going straight or turning side to side? Ask the Blue tunder the real tech stuff. I think you will be surprised.