What size fittings do I use for a GE vacuum manifold?

I thought they were 1/8 ntp thread but the brass ones I bought today only screw in one turn.

Also I was reading this thread: https://honda-tech.com/zerothread/1263795

This guy says to use 1/4ntp thread side and 1/8 barbed side???

So which fitting do I need.

Also should what should the barb side size be for the blow off valve, wastegate and boost gauge?

Thanks

 

hey take it easy...it nothing but fittings....each fitting comes threaded on one side with 1/4 thread and the barbed fitting is on the other side where the hose slides on (this is all on ONE fitting)...the barbed fitting could be either 1/4 or 1/8 for whatever application u want...its a choice when you go to a hardware store....for exmaple some FPR's come with 1/4 fittings so you wanna make it simple and run that 1/4 hose to a 1/4 barbed fitting on the vacum manifold....most apps on your car would be 1/4 like wg, bov....etc

the source size is am not sure what size the brake booster hose is!

 

thanks for the reply

i was just confused because the instructions said 1/8ntp fittings.

So when I go back to the hardware store just get 1/4 ntp fitting to whatever barb size I need.

 

exactly! but it would help if you take teh vac manifold with you there to double check that it is 1/4! if it GE or Fast Turbo version they are 1/4, but some poeple buy them off ebay or even custom make them!

good luck and glad i could help