brake booster vacuum fitting on back side of quadrajet carb base plate

[GSP7]

What is the proper thread sealant to use on the threads of the brake booster vacuum fitting on back side of quadrajet carb base plate?  If any....

I know I wont use teflon tape

[GSP7]

I have some brush on white stuff, pipe thread sealer, think its a teflon paste , or I have some anti seize/thread sealer I use on head bolts etc...

Or ?  Or use nothin' ?

[Kenth]

Vacuum National Pipe Threads needs no sealant.

[GSP7]

 

[Cliff Ruggles]

I use a very small amount of liquid thread sealant (PTFE) on all NPT fittings, NEVER Teflon tape.  The reason I use it as it not only seals the threads is provides some lubricant so they don't bind up and split the casting.  The baseplates drilled and tapped for 1/4" NPT threads are pretty thin and crack easily if you over-tighten the rear fitting......

[Kenth]

Use lubricant with caution on fuel and vacuum fittings NPT threads as it makes it easier to overtighten and crack the hole.