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Old 03-13-2020, 12:22 PM   #1
JayJay
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Default Head stud holes into block water jacket?

Folks - Newbie (to the forum) here with a question. I pulled the cylinder head on my '30 pickup and the studs appeared to be old, if not original. In the process of installing new ones I chased the block threads with a tap. I found several of the holes went all the way through into the water jacket. Is this right? I suppose there's nothing inherently bad, I was just expecting blind holes. Last Model A engine I rebuilt was in the late '60s and frankly I don't recall one way or the other.

BTW, 76K miles on the clock, standard diameter pistons, compression high 60s psi. Wow. On the other hand, I haven't looked at the bottom end yet...

Thanks in advance.

JayJay
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Old 03-13-2020, 12:29 PM   #2
nick c
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Default Re: Head stud holes into block water jacket?

Yes, some tapped holes do enter the water jacket, I coat them with hard setting Permatex and a small amount in the threaded hole.
carry on
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Old 03-13-2020, 12:42 PM   #3
100IH
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Default Re: Head stud holes into block water jacket?

Through holes are known as wet holes and i agree that they must be coated with a sealer and Permatex #2 is the preferred stuff. So map them out and seal them so they won't seep coolant up through the head.
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Old 03-13-2020, 01:06 PM   #4
30 Closed Cab PU
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Default Re: Head stud holes into block water jacket?

Same is true on a few oil pan bolts, also a couple on the water pump.
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Old 03-13-2020, 02:30 PM   #5
JayJay
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Default Re: Head stud holes into block water jacket?

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Thanks, folks for the feedback. I really appreciate it.


Best wishes.


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