summit cams do not meet usa standards
Most cams in the US (including OEM) are made by Camshaft Machine Company.
Camshaft Machine Company
Summit and Edelbrock have some of the same grinds. All made by Camshaft Machine Co. Also back about 20 years or so ago, Wolverine Blue Racer cams were the same as Edelbrock as well. Made by (you guessed it) Camshaft Machine Co.