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5/16 if I recall. Summit has them in stainless pretty cheap.
 

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Also, remember that some acc. and brackets are sometimes bolted to the manifold through the use of special bolts with a stud on top. Diddo on the stainless intake bolts from Summit; they are on my truck right now.
 

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5/16 x 2" coarse thread. I would suggest washers with an aluminum intake and studs are nice with aluminum heads. [but expensive]
 
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