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04-08-2018, 06:24 PM | #1 |
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unusual head torque issue
Not really an issue, just curious. I have a fresh rebuild with a 5.5 head initially torqued to 60 lbs. Ran it once and got some good heat through it, cooled off completely and went to re torque the nuts. Unlike a dozen times before on various engines, the nuts held they're torque. I pulled up to 75 pounds thinking they would "TINK" and then turn at a lower value, but they didn't budge, so I let off. I'm fine with it, I guess, just never experienced this before. Thoughts from the experts?
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04-08-2018, 06:39 PM | #2 |
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Re: unusual head torque issue
Don't worry about it. Run it 50 miles and check them again.
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04-08-2018, 06:44 PM | #3 |
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Re: unusual head torque issue
Im at the same stage but on a 59 V8 . I've had motors hold but this time after first heat cycle I felt some of the bolts move. That right I used 8ba bolts on a 59 ,no studs . First try ...
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04-08-2018, 08:00 PM | #4 |
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Re: unusual head torque issue
So I'm confused. What is your final torque?
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04-08-2018, 09:47 PM | #5 |
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Re: unusual head torque issue
It's called "stiction", that initial resistance to turning. Always back off the nut about a quarter turn or so first, then torque to specs.
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04-08-2018, 10:05 PM | #6 |
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Re: unusual head torque issue
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04-08-2018, 10:15 PM | #7 |
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Re: unusual head torque issue
What head gasket did you use?
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04-09-2018, 05:12 AM | #8 |
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Re: unusual head torque issue
Did you install the head gasket? I will post a guess after you answer this.
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04-09-2018, 05:45 AM | #9 |
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Re: unusual head torque issue
One, I always thought never to back off the nut.
Two, 75 lbs is too much. It should be 55 lbs. |
04-09-2018, 06:09 AM | #10 |
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Re: unusual head torque issue
It is a Rich Fallucca engine. I don't know what kind of head gasket he used. I am inclined to leave it alone as some have suggested. I did not tighten them to 75, because they didn't move. They are still at the initial 60 lbs.
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04-09-2018, 01:34 PM | #11 |
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Re: unusual head torque issue
If the nuts are stuck on the threads you don't really know what the torque is.
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04-09-2018, 07:26 PM | #12 |
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Re: unusual head torque issue
I use ARP Ultra-Torque Assembly Lube on head nuts. Nuts don't stick to the threads.
I worried about the nuts loosening, but that a has not happened yet. I torque Model A heads to 55 lbs. |
04-10-2018, 05:51 AM | #13 |
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Re: unusual head torque issue
The only time I found a head gasket (copper) that didn't compress after a heat cycle is when an old gasket was re-used. They don't compress because it is compressed as much as possible. Gaskets can be re-used BUT, not on a new customer engine without the customers knowledge.
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