Vacant 14mm bolt on exhaust side of left bank cylinder head

I am curious what the vacant 14mm bolt on the front of the exhaust side of left bank cylinder head is. Hole to the right is the cylinder 2 exhaust manifold, right under drivebelt tensioner bolt hole. Is it just there for optional accessories?

 

That would be your coolant drain for the block. There should be a similar one on the passenger side too. If you're doing a coolant flush and fill, drain your block too by using those two bolts. The drain hole is about 1/2" below that bolt. You can see it just below your red circle. Hope that helps!

-J

 

No, that is NOT the coolant drain.
That is for the VVT filter.
https://www.tacomaworld.com/threads/this-is-why-you-need-to-replace-your-vvt-screens.639996/

 

Ah, correct. The little elbow below the bolt messed me up. Coolant drain and fill is what I was thinking when I posted my reply.

-J