I've started a new post, because the current one on this site re the illusive Camshaft spec's goes back "11 years" now & also deals with the "F" code shaft.. In issue # 122, Jan-Feb. 2021, of Y-Block magazine, was a copy of a letter to a Mr. John Wilson, originally dated Dec. 11 1957. It was from Iskendarian Racing Cams & signed by their then Shop Foreman Sig Erson. The original inquiry was not included, but Sig recommended that Wilson upgrade beyond his initial enquiry to the "E-2 Revmaster Track", which had intake specs of 17/59 & exhaust of 13/63. However, I suspect there was a mistake here on his part, as he listed the valve lift as .410" on both intake & exhaust. (that was less than the std. "D" code cam)  But, more importantly, he listed the Cam as having a "stock Ford" part number. That # was ECZ 6250-C.. I've long suspected that the upgraded E code cam was the E-2 & I believe this confirms it..    


Paul