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bolt size to plug air tube holes in the exhaust

hf240z
in Help Me !!

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i am removing those air tubes that comes out of the exhaust manifold of my 72 240z. i need to plug those holes. will anyone kind enough to help me figure out the size of bolt that i need to plug those six thread holes? thanks , hf

I just went through it .... on my header though.

The thread size for the EGR is metric ( 22x1.5 )

My header had another threaded bung it is also

metric ( 20x1.5 )

I hope i helped.

-Jeff

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