The Carter YH was a sidedraft carburetor similar to the YF (downdraft) carburetor. It was used on various automotive and marine applications from 1952 to 1966, notably in a set of three carbs for the 1952-1955 Corvette 6 cylinder, and dual carbs in Nashes, Corvettes and Ford marine applications.
The 2066S Carter YH used on Corvettes had a larger-orifice, spring loaded needle/seat which we have in our CK4934 triple-carb kit.