Vacuum advance port. How to drill & tap

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Re: Vacuum advence port. How to drill & tap

i think the general consensus is to weld some thicker material on the intakes and tap them there

or to do what danny did.


Yeah, Holley & NOS say the best spot is in the intake runner....maybe for the best mixing....:confused2:
 
Drilled and tapped them. I found that I had at least 5 threads of depth which seemed enough with the 1/16th npt fittings.
 

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Nice....Stealthy! :clapping: 5 threads should be plenty, there's no pressure trying to push them out, just the opposite, actually. That set-up will work great! :punk:
 
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