Well, since the previous owner of my car screwed up the AIR pipes (along with a ton of other things), I'm removing the air system when I change the exhaust. I have the big SLP Y-pipe, and am running that directly (no cat) into the flowmaster system that's on the car.

What do I use to plug the AIR fittings in the manifolds? Are they NTP thread? BSP? Metric? Martian?

I wanna plug them nicely if possible, and not screw things up too much. If need be, I'll just snip the AIR fitting just beyond the nut, weld it closed, and reinstall it in all 8 ports. That just sounds like too much work though...

Help?

 

just take out each pipe,and get brass plugs to put in their place.thats what ive heard to do,and will be doing it as soon as i get the time to find brass plugs that will fit.does anyone know what size they are by any chance?

 

I went down to the hard ware store and picked up some pipe threaded plugs, I think they were 1/4...or maybe a 1/2, get out the ruler

 

They were 1/4 NPT (pipe thread) on my stock cast iron Ex. manifolds. The cool ones are a recessed hex (allen wrench) style instead of the crude looking square pipe wrench style.

 

8 plugs, to much work. I took the tube that the four hooked up to and put a brass fitting on that one. easy and the problem is solved. It seems like I am the only one that has thought about doing it like that, am I wrong for doing so??

 

I did the weld em up thing on a buick...didn't take too long at all...bout an hour to do the whole thing. Course there was more room to work in the engine bay too.

 

88 bravo,

the reason most take the whole air system out (8 plugs) is to have more room to work on your engine, If I didn't need the room (you must not need the room) then I'd would have either left the air on, or did what you did

 

Its some screwball metric pipe, BUT, 1/4 pipe brass pipe plugs work nicley. Just make sure to use brass, as it is soft enough to conform to the thread pitch in the manifolds. I usually use a little hi-temp red silicone on the threads for extra insurance against leaks.