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In my 68 GTO with factory air, from a vacuum about how many lbs of R 12 does the system hold??

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My 69 Factory Service Manual says 4 1/8 pounds (if you're filling by weight from a large drum) or 4 1/3 cans (if you're filling from individual disposable cans of R-12) plus 11 ozs. of oil. I've also got oil re-fill specs for any individual components you may have replaced if you need that. If you haven't replaced anything, then you shouldn't need to add any oil.

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According to the 67 Service manual....3 3/4 lbs for Tempest series. 4 1/8 lbs for fullsize Pontiacs. That is after evacuating the system and vacuuming it down.
 
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