I have this stuf bolted on the rear of intake manifold and connected to a metallic tube entering the C6. It looks like an adjustable valve. Does anyone know what it is? (is it to regulate vacuum level?)
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blue cap removed
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That looks like an emissions piece; the Vacuum Advance Control Valve. 
Chrysler used on like it back in the day as well:
http://www.allpar.com/fix/engines/cap-valve.html
One on Ebay; look familiar?
http://www.ebay.com/itm/68-GAL...em3f4f1f02e9&vxp=mtr
Chrysler used on like it back in the day as well:
http://www.allpar.com/fix/engines/cap-valve.html
One on Ebay; look familiar?
http://www.ebay.com/itm/68-GAL...em3f4f1f02e9&vxp=mtr
quote:racheliane
if my memory serves me correctly from my 1968 Ford Torino GT with a C6 trans it is the vacuum modulator it supplies vacuum to the valve body in the trans to set the shift points. if you want to see if I am correct take the line off and plug it and if your tranny shifts at wide open throttle I am correct. The above pics are for the engine timing. Let me know.