Hi, I recently acquired this intake manifold and am just curious what it is. I was told it was used on the 216/235/261 6 cylinders when they were converted to propane for more power, but the ports look a bit too big. Could it possibly be for a GMC or something like that? I have absolutely no clue. It was made by the Johnson Machine Company. Thank you.

http://chuddy117.homestead.com/propane.html

Chad

1955 Chevrolet 210 2 door Sedan
a 30,000 mile UNMOLESTED original, now my daily driver! Original 6 cylinder with a rebuilt '66-'69 Saginaw 3-speed Overdrive. Synchro low! Otherwise, everything original down to the spare tire. Interior is like new. Needs paint, but absolutely zero rust.