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I just did this on my 77 W/CIS.
I disconnected the vac hose for the Deceleration valve and ran a hose from the throttle body to into a gallon jug of distilled water. The engine vacuum sucked the water out of the jug.
I took the motor up to about 3k rpm and it took about 2 minutes to empty the jug and left a load of black crud on the driveway.
I waited for the engine to come up to full operating temp before I did this. Afterward the intake tubes were cold to the touch and the oil temp came down to just below 170. (not essential to the plot, but I thought it was interesting)
After it warmed back up the idle was smoother than ever. I took it for a spin and WOW! I won’t guess how much power I regained but it is amazing to say the least.
I'm a believer!
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big AL
'77 911
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