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RE: 'S-tube'? No such thing, for '67 390. I think you mean a PCV tube... By Barry B - 01/19/2005 3:08:34 PM; IP 64.162.186.125 Here's the only pic I have of a '67 390GT intake with the tube attached. The front end screws into the fitting on the intake and the rear end uses a short piece of hose to connect to the other fitting. The end of the long hose attached goes to a right-angle fitting in which the PVC valve is screwed into. The PVC then inserts into the valve cover grommet. The Ford technical stuff I have read refers to this as a balance tube. They say by connecting the two intake runners the PVC gets a better signal and if the PVC were to be connected to only one of the ports, there would be excessive pulsing at the valve (plus I think it would lean out that runner). Ok, enough babbling, here's the pic:

This thread, so far...

Skip Navigation Links.  any diagrams for s-tube for 67 390GT? -- Clint, 12/30/2004  'S-tube'? No such thing, for '67 390. I think you mean a PCV tube... -- Mr F, 12/31/2004  RE: 'S-tube'? No such thing, for '67 390. I think you mean a PCV tube... -- Clint, 01/19/2005 RE: 'S-tube'? No such thing, for '67 390. I think you mean a PCV tube... -- Barry B, 01/19/2005  RE: 'S-tube'? No such thing, for '67 390. I think you mean a PCV tube... -- Barry B, 01/19/2005  RE: 'S-tube'? No such thing, for '67 390. I think you mean a PCV tube... -- Clint, 01/20/2005  And, while you're at it, you might want to consider... -- Mr F, 12/31/2004

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