The Thermac feed line off the intake nipple wasn't hooked up on the black car for that exact reason. I have never seen an original set of valves that didn't leak, even slightly so I was capped the intake nipple off. I like to keep the vacuum leaks to a minimum. The cars run better that way.
I have a question while we are on the subject: so how does the 73 set up feed? The air cleaner on my SD has the feed line just hanging there, too. I can't locate an outlet on the intake or carb that is not already hooked up to something.
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