I'm in a rush, the plug I had there somehow vibrated loose and popped off somewhere. I have looked everywhere and noe of the pipe plugs I can find are the right size so what size do I need? I have heard of people using oild drain plugs for this but I' still need a size. Help ASAP!

 

My fault and in a rush...I mean the holes in the header where the AIR emissions system is supposed to go.

 

Let me know when you find out! Been needing this info for a while!

 

I used an M22 oil drain plug from NAPA

 

^ yep thats what works..i listed the threads an **** once but i cant remember..lool on advanced or autozone on here and it might say what the thread size is so you can go to ace or lowes and get one

 

M22 for OBDI, M18 for OBDII.

 

what about when the threads are on the outside of the AIR plugs on the headers?

 

When are the threads on the outside?

 

M22 fit perfect! Thanks

 

M22 x 1.5 I just bought 2 and put them in the manifold on a B-body LT1 in a 70 C-10. They had them on the shelf at Oreilly's

 

ive read about that on here,its an after market header that is like that..not sure of its pace,headman or another..

 

pacesetters, got them 2 yrs ago and the threads are on the outside.

 

Unless I could tap new threads on the inside and use those threads??

 

I'm not sure of the OD threads on aftermarket parts, sorry.

 

You're welcome.

 

Also, just for reference, the M22 is the drain plug for a Dodge Ram equipped with a 5.9 liter Cummins diesel.