Tim,
Yes that's what it is. However I just went down to the hardware and got a pipe bushing. 1/2 to 3/8 and it was sloppy. As Jerry said, it must be a regular thread. Perhaps I'll grab a 1/2 to 1/4, drill it out and then tap it to fit if I can't find a proper one locally.
Panel, yes it's Canadian with the big port. I'm not sure of port size on earlier Canadian head for a 261.
Last edited by Fox; 01/14/2018 8:52 PM.
