Cooling fitting thread size

[sj-masher]

I'm going to drill and tap my Factory Pipe exhaust manifold for dual cooling. I've got the fitting but what size threads are they? I need to buy a tap.

Thanks

 

[Ducky]

They are 1/8 NPT

 

[sj-masher]

Thanks for the quick reply. Is that fine thread? Is there fine thread on NPT?

 

[Ducky]

Thanks for the quick reply. Is that fine thread? Is there fine thread on NPT?

I dont think that is considered fine thread. Look for a 1/8-27 npt tap and youll be good to go.