Not sure why you would use a screwdriver?
The 194-292 heads has threads like a bolt, but has no head.

It unscrews like a stud would.

I am speaking about the 194,230,250,292 heads.
No description of what engine.
Is the alignment dowel like the one used for the cyl head?
No threads?

MBHD

 Originally Posted By: bcowanwheels
i also use vise grips but with a screwdriver inbetween as a pry. twist the pin while prying out.

12 port SDS EFI