Hey guys i have some questions about allen bolts in/out of the head

I know the one on top is for cam seal bolts what about the one below ?

The small sized allen bolt whats that for?

This is at the end of the cam there’s a allen screw as well

This is right beside the place where we install our spark plug and here’s a huge allen sized bolt for?


i have search the internet for as much but i cant seem to find any information about these bolts so hopefully someone out here can help me
please and thank you 😂

 

theyre just plugs for holes that are needed to complete the machining.

 

Those are called core plugs. There is nothing to service under them. No additional bolts to access.

They are sometimes used to clean out oil and coolant passages but otherwise they should not be touched.

 

Thanks guys got it oil galleys/coolant galleys