At idle I have 15hg of vacuum and the gauge flickers slightly.
I am thinking the plug and the vacuum nipple I put on the intake might be the culprit , or one of. What is the best thing to use as a sealant for them , the tape or the sealant in the tube.
I have used the sealant , but it seems to run up the threads when I tighten it down .

Thanks for your replies

Dave

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81 Dodge D150
It looked easier in the book .

Dave
Ive had problems with both types...that being said what works for me is putting the dope type on a let it sit overnight then put it in. Seems to set up some then stay put better.
Frank

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Scrapple: Because a mind is a terrible thing to waste.
73 Duster - Race Car
66 Dart Wagon - DD
178" FED
82 D150
All Slant powered

No sealant should be necessary; that's a tapered (pipe) thread that self-seals when you thread it in securely. If the plug or fitting you're using doesn't grow tight as you thread it in, it's not the correct thread and it'll leak.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

That vacuum reading is low. Stock cam? Did the gauge flutter before?

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'72 Duster 198 stock cam, 3:23's Hookers on jack stands for 8 years in the driveway
'79 Maxivan 360 Offy Qjet Comp RV cam/rusting in the driveway.
93 D350 160HP Cummins Auto Dually Clubcab needs a injector pump
2005 Golden Couch Buick

Yes, that is a low reading and should be 18 or 19". Hook it up to the carb not the number 6 intake runner.

When was the last time you set your valves?

or does your motor have an after market cam with allot of overlap?

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Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

Ted , I have never set my valves, my motor has like 72,000 miles.

Dan, I am using some sealant because the vacuum tree that was in it was broke, and it took some messing with to get it out. It is just a just in case thing to eliminate it as a cause, but it does tighten

Frank , I was thinking about letting it sit overnight , so thanks for the info.


Rug Trucker ,everything is stock. it now read at 650 rpm it read 16hg, and at around 1000rpm it reads 19hg.

I will have to do some more investigating when I get a chance.


Thanks for all of your replies
Dave

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81 Dodge D150
It looked easier in the book .

On the valve adjustment , I guess if I have hydraulic lifters there is no need to adjust valves , is this right ?


Dave

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81 Dodge D150
It looked easier in the book .

you are correct

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If it was easy, everybody would be doing it.

Unless your motor was swapped you should have solid lifters. 18-19 is a good idle vacuum.

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'72 Duster 198 stock cam, 3:23's Hookers on jack stands for 8 years in the driveway
'79 Maxivan 360 Offy Qjet Comp RV cam/rusting in the driveway.
93 D350 160HP Cummins Auto Dually Clubcab needs a injector pump
2005 Golden Couch Buick