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johnneilson · 03-16-2021, 10:06 PM

I am going to try and be gentle here, but, hand drilling out studs is just bad practice.
The reasons are many, such as drilling off center, going too deep and breaking into the water jacket and just ending up with crooked studs. There are people with the machinery to do a proper job, in most cases the studs can be removed and the threads saved in the block.

I see blocks that are butchered up so bad that I just refuse to make anything other than farm implement ballast out of them. I have done the time savers, made sealed inserts and done heli-coils. All of the fixes work, for a while. Over torquing will just accelerate the failure rate.

FWIW, a properly installed heli-coil will test to 75 ft/lbs or higher. No good blocks were used in this testing. Just doing proof of concept.

John

03-16-2021, 10:06 PM	#10
johnneilson Senior Member Join Date: Jun 2010 Location: 34.22 N 118.36 W Posts: 1,057	Re: Head Stud Q... I am going to try and be gentle here, but, hand drilling out studs is just bad practice. The reasons are many, such as drilling off center, going too deep and breaking into the water jacket and just ending up with crooked studs. There are people with the machinery to do a proper job, in most cases the studs can be removed and the threads saved in the block. I see blocks that are butchered up so bad that I just refuse to make anything other than farm implement ballast out of them. I have done the time savers, made sealed inserts and done heli-coils. All of the fixes work, for a while. Over torquing will just accelerate the failure rate. FWIW, a properly installed heli-coil will test to 75 ft/lbs or higher. No good blocks were used in this testing. Just doing proof of concept. John __________________ As Carroll Smith wrote; All Failures are Human in Origin.