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I got a set of Shankle headers that have threaded ports in them, that I can only imagine are for air injection for some sort of emissions control??
See attached pix.

Anyone know what they are, AND what size thread they are so I can plug them up?

Thanks.

Shankle headers-2 arrows.jpg


20210223_172047 arrows.jpg


20210223_172043.jpg
Shankle headers.jpg
 

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Stock ones in the cast headers are not pipe threads, they are metric, like 10mm maybe, with a compression fitting on the end of the air injector so a beveled end. I'd assume these are designed to work with the stock air rail but i don't have one handy to check threads. My guess is M10 x 1.0 but it's just that, a guess.
Andrew
 

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If anyone has an air rail sitting around that's the thread on the four jets.
Andrew
 

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Might these have also been for EGT on a performance motor?
 
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