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Head bolt recommendations
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pungobob View Drop Down
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Joined: 15 Mar 2023
Location: Belhaven NC
Points: 83 		Post Options Post Options   Thanks (0) Thanks(0)   Quote pungobob Quote  Post ReplyReply Direct Link To This Post Topic: Head bolt recommendations
    Posted: 06 Apr 2023 at 5:41pm
Well I got extremely lucky and only broke four of the head bolts on my G. Now I need some help from the G gurus here on the forum. The bolts I was able to remove are badly corroded and will not be going back in my engine. My question: what is the best bolt material should I use to replace  the bolts? Grade 8, stainless steel? Any recommendations will be greatly appreciated.
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
Location: illinois
Points: 87858 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 06 Apr 2023 at 5:43pm
i bought a disassemble "B" motor 20 years ago... had no head bolts.. I just bought grade 8 steel bolts and put it together.... 20 years ago.
Like them all, but love the "B"s.
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Jim.ME View Drop Down
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Joined: 19 Nov 2016
Location: Maine
Points: 962 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Jim.ME Quote  Post ReplyReply Direct Link To This Post Posted: 06 Apr 2023 at 6:47pm
Not stainless.  They are softer than most realize and threads gall easily.  Use Grade 8
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pungobob View Drop Down
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Joined: 15 Mar 2023
Location: Belhaven NC
Points: 83 		Post Options Post Options   Thanks (0) Thanks(0)   Quote pungobob Quote  Post ReplyReply Direct Link To This Post Posted: 06 Apr 2023 at 8:08pm
Thanks Jim and Steve. I was in the marine industry for a lot of years and completely understand the galling tendency with stainless. Grade 8 it is. Thanks again for the help.
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 21902 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 07 Apr 2023 at 6:38am
Run a bottoming tap down each and every head bolt hole in the block. Rinse/wash out with brake kleen and use compressed air to blow out remaining any dirt. Wipe grease lightly on new head bolt threads for lube. Torque to spec. Retorque after a few hours of running time when engine is stone cold.
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pungobob View Drop Down
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Joined: 15 Mar 2023
Location: Belhaven NC
Points: 83 		Post Options Post Options   Thanks (0) Thanks(0)   Quote pungobob Quote  Post ReplyReply Direct Link To This Post Posted: 07 Apr 2023 at 7:07am
Thanks for the reply Dr Allis. I have got the bottom taps on hand. Waiting on my torch tanks to get filled so I get heat up a couple of the broken off bolts and studs to facilitate getting the head off. No need to get in a hurry.
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