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Synchro909 · 10-29-2014, 04:44 PM

I back using the head as a template. Make up a few sleeves with OD the same as the stud hole in the head and ID gradually increasing for the drill size you want to use. Put the other studs back in and bolt the head down. Now use your sleeves to guide the drill down the centre of the broken stud. You might have to take the head off a few times to check your progress, especially when you are getting close but after 85 years, a few more minutes doesn't matter.
As a last resort, Helicoils work well so don't despair if it doesn't seem to be going well.

10-29-2014, 04:44 PM	#23
Synchro909 Senior Member Join Date: Jun 2014 Location: Melbourne, Australia Posts: 7,497	Re: Broken head studs I back using the head as a template. Make up a few sleeves with OD the same as the stud hole in the head and ID gradually increasing for the drill size you want to use. Put the other studs back in and bolt the head down. Now use your sleeves to guide the drill down the centre of the broken stud. You might have to take the head off a few times to check your progress, especially when you are getting close but after 85 years, a few more minutes doesn't matter. As a last resort, Helicoils work well so don't despair if it doesn't seem to be going well.