check out these head studs...

[DSMjrv]

okay ive only taken one head off before, and they were stock studs and i had to u a 10mm allen socket to get em out... now in taking this head off these studs are way different... they fit a 5mm.... and i cant turn em loose, if i apply any more pressure than i have il just end up stripping the stud and my socket... what special tool do i need? none of my normal (non-allen) sockets will fit over the larger base beneath the 5mm allen part of the bolt.... only socket i havent tried is a 16mm ### i dont have one...

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[RotaryRyan]

Ok, stock ones are head BOLTS. That's what you took off with a 10mm Allen wrench.

What you have now sounds like ARP head STUDS which will have nuts on top. They will take a 14mm 12-point socket if that's the case. They do have a small hex/allen hole on the top to screw them in and out once the head is off.

 

[Turbizmo]

arent those pic a bit big :0

 

[Marc91GSX]

Those are ARP Studs so take the advise of the second poster. (14mm 12 point socket). Also PM a moderator and have them fix that photo if you can't. It is way too big and will cause people problems when they view this thread.