Missing exhaust manifold bolt, whats size

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Ohearchai

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Washington
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Martin
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1990
Truck Model
V1500 Suburban
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5.7
Missing a bolt, what size, hole was there for a reason at one time but I forget.
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Tank6x2

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Edmonton Alberta Canada
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Kurt
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79/86
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C30
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350, TH400.4:10 gears 2WD
Someone correct me if I’m wrong but that’s 1/2” npt plug
 

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