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I’ve read the previous posts on the 390 GT idler pulleys but I have two idler pulleys and need some expertise identifying them. The one on the left I believe is a 68 390 idler with “SPC” on it. I’ve seen Jeff and Bob say early 68 and late 68, my car was built June 68 in Metuchen so I think the one on the left is correct for it. If some clarity on the rough estimate when early and late would be for the AC set up would be appreciated.The pulley on the right is I believe a 1970 390 AC idler pulley it’s much flatter and has even bend lines on the back. What say you?The first three photos after the pairing of parts is the left one.
Perfect thanks for the help, now if I can locate a 68 390 idler pulley I will be all set
I think that you have a 1968 390 idler. Compare the cap diameter of your small block idler marked SPC. That one does have a small bearing. The photos make them look equal. See this thread: http://www.concoursmustang.com/forum/index.php?topic=19404.msg122678#msg122678
....... It even appears the same as one in Jeff’s 68 390 AC kit below. .......