what size is the head stud threads etc for 24 stud v8 merc

[Lynn Eades]

I would just be a bit concerned about the teflon letting the studs over tighten, causing distortion.
I have read that the piston to bore clearance is markedly different depending on the use(or not) of a torque plate.
Apparently the flatties are weak in this area, and care needs to be taken.
A teflon type sealant with the low friction co-efficient might just force that casting out of shape.
I too have used the loctite thread sealant for years, and find it a magic product. Just not sure in this application.