# Head bolt holes

**URL:** <https://forums.speedlife.net/t/head-bolt-holes/182079>\
**Category:** PittSpeed Automotive\
**Created:** [May 6, 2006, 11:16am UTC](https://forums.speedlife.net/t/head-bolt-holes/182079 "2006-05-06T11:16:40Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![Jeff95TA](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/jeff95ta/32/5935_2.png) [@Jeff95TA](https://forums.speedlife.net/u/Jeff95TA)\
**Post date:** [May 6, 2006, 11:16am UTC](https://forums.speedlife.net/t/head-bolt-holes/182079/1 "2006-05-06T11:16:40Z")

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I’m putting the heads on my new short block and have a quesiton about the thread sealer. ARP directions say to only use the thread sealer on the bolts going into the water jacket, not on blind holes. The top four head bolt holes are blind holes BUT several of them have a small hole in them. Looks like they were tapped too deep or just corroded through a little. Would these go into a water passage (I think) or an oil passage? Is it okay that there are holes? Just put some thread sealer on those ones too?

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**Author:** ![Jeff95TA](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/jeff95ta/32/5935_2.png) [@Jeff95TA](https://forums.speedlife.net/u/Jeff95TA)\
**Post date:** [May 6, 2006, 11:41am UTC](https://forums.speedlife.net/t/head-bolt-holes/182079/2 "2006-05-06T11:41:02Z")

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Never mind. Did a little more searching and found that it’s possible for those holes to be drilled a little too deep and break into the coolant passage. Thread sealer on them should do the trick.

See, reading books does help. 😉

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**Author:** ![eurodad](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/eurodad/32/5988_2.png) [@eurodad](https://forums.speedlife.net/u/eurodad)\
**Post date:** [May 6, 2006, 11:58am UTC](https://forums.speedlife.net/t/head-bolt-holes/182079/3 "2006-05-06T11:58:31Z")

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i put thread sealer on all the headbolts and manifold bolts on my sbc

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**Author:** ![Pewter](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/pewter/32/5936_2.png) [@Pewter](https://forums.speedlife.net/u/Pewter)\
**Post date:** [May 6, 2006, 1:26pm UTC](https://forums.speedlife.net/t/head-bolt-holes/182079/4 "2006-05-06T13:26:02Z")

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[QUOTE=5ltr eater]i put thread sealer on all the headbolts and on my gen III [QUOTE]

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**Author:** ![German\_with\_a\_Bowtie](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/german_with_a_bowtie/32/5967_2.png) [@German\_with\_a\_Bowtie](https://forums.speedlife.net/u/German_with_a_Bowtie)\
**Post date:** [May 6, 2006, 1:49pm UTC](https://forums.speedlife.net/t/head-bolt-holes/182079/5 "2006-05-06T13:49:11Z")

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…

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**Author:** ![Pewter](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/pewter/32/5936_2.png) [@Pewter](https://forums.speedlife.net/u/Pewter)\
**Post date:** [May 6, 2006, 2:04pm UTC](https://forums.speedlife.net/t/head-bolt-holes/182079/6 "2006-05-06T14:04:48Z")

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> [@GeneralG](#):
>
> Agreed…evens out torque readings too.
> 
> I also put a little 30W on the under head radius of the bolt and washers if so equipped - All bolts will have the same clamping force 🙂

:blue:

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**Author:** ![Jeff95TA](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/jeff95ta/32/5935_2.png) [@Jeff95TA](https://forums.speedlife.net/u/Jeff95TA)\
**Post date:** [May 6, 2006, 2:35pm UTC](https://forums.speedlife.net/t/head-bolt-holes/182079/7 "2006-05-06T14:35:07Z")

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I used some moly lube under the heads & washers.

It is sooooo much nicer doing this on an engine stand instead of leaning over the fenders.