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I believe comes from a switchover valve located under the intake. But it's been awhile so not 100% sure. I think the switchover valve gets it from a nipple that's under there also.
edit: I could be thinking of a 606 diesel engine......
Gilly
edit again: except a diesel wouldn't be getting the vacuum from the intake, hmmm, I think I might be OK with my first reaction, I am pretty sure there is a vacuum port or two under the intake, bear to see/look at or even feel, and a vac s/o valve right nearby.
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