SBC thread sizes

[KCP]

I ripped out the smog pump today and need to close the holes in the exhaust. Anyone knows the thread size of these? Also the bolt for the oil dipstick is missing, what thread size is this one? I guess the engine is still SAE and not metric?

 

[pagrunt]

Manifold is 1/4"-18 NPT (pipe thread) & that spot in the block is 5/16"-18.

 

[Ribbedroof]

The one in the block is for the (missing) starter brace

 

[KCP]

The one in the block is for the (missing) starter brace

So the oil dip stick and the starter brace share the same bolt?

Manifold is 1/4"-18 NPT (pipe thread) & that spot in the block is 5/16"-18.

Thanks!