Spark plug torque specs?

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Jtcaprice
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Joined: Sun Sep 10, 2017 3:10 pm

Spark plug torque specs?

Post by Jtcaprice » Wed Oct 25, 2017 6:53 pm

Hey guys, anyone know what the spark plug torque down recommendations are for the l77? Just bought ngk iridium IX's. Car only has 69k on the odometer, but we know how they're idled..... So I wanna go ahead and swap them tonight. Advice would be greatly appreciated. It's now my only car and I drive around 60 miles daily.

smwalker
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Re: Spark plug torque specs?

Post by smwalker » Wed Oct 25, 2017 7:04 pm

15 foot lbs. seems to be the consensus from a couple sources.

That is if you can actually get a torque wrench in there!
Steve Walker
Azusa, CA
'11 PPV 9C3 Huron White

Jtcaprice
Posts: 20
Joined: Sun Sep 10, 2017 3:10 pm

Re: Spark plug torque specs?

Post by Jtcaprice » Wed Oct 25, 2017 7:08 pm

Do you think it matters? I never torqued my other cars. I'm just really careful with this one becauseI love it so much. And I NEED it.

Jtcaprice
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Re: Spark plug torque specs?

Post by Jtcaprice » Wed Oct 25, 2017 7:12 pm

And no I won't be able to get one down there, so I assume it doesn't matter lol

smwalker
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Re: Spark plug torque specs?

Post by smwalker » Wed Oct 25, 2017 7:25 pm

Yes it will matter to a degree. We got aluminum heads so overtorque can lead to damage. Do the easily accessible ones first with a torque wrench to get the feel for the correct setting. Then just try to get close on the harder ones.
Steve Walker
Azusa, CA
'11 PPV 9C3 Huron White

kevink
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Re: Spark plug torque specs?

Post by kevink » Wed Oct 25, 2017 8:58 pm

smwalker wrote:15 foot lbs. seems to be the consensus from a couple sources.

That is if you can actually get a torque wrench in there!
smwalker wrote:Yes it will matter to a degree. We got aluminum heads so overtorque can lead to damage. Do the easily accessible ones first with a torque wrench to get the feel for the correct setting. Then just try to get close on the harder ones.
15 lbs is for a new head. All subsequent installations get 11 lbs. You can easily get a torque wrench on all of the plugs. For future reference:
http://www.ls1howto.com/index.php?category=1

Jtcaprice
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Re: Spark plug torque specs?

Post by Jtcaprice » Thu Oct 26, 2017 3:12 am

Thanks Steve, you're always a great help.

CrashTestDummy
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Re: Spark plug torque specs?

Post by CrashTestDummy » Thu Oct 26, 2017 1:42 pm

Since you have differing metals working together there, I find using anti-seize is more important than using a torque wrench. It helps prevent galled threads and stuck plugs.
Gene Beaird,
Pearland, Texas
2012 Caprice 9C1
1992 B4C 1LE Camaro
2010 Tahoe PPV (her car)
1995 DGGM Impala SS
1996 BBB Impala SS (11-second DD)
1985 Firebird - 310 LS1 C Prepared autocross car.
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smwalker
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Re: Spark plug torque specs?

Post by smwalker » Thu Oct 26, 2017 6:39 pm

kevink wrote:
15 lbs is for a new head. All subsequent installations get 11 lbs. You can easily get a torque wrench on all of the plugs. For future reference:
http://www.ls1howto.com/index.php?category=1
I read that but it did not jive with the service manual. They talk about a lower torque for reinstalling the same plugs.

Image


Why would it be lower for send set of plugs? Threads get weaker?
Steve Walker
Azusa, CA
'11 PPV 9C3 Huron White

smwalker
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Re: Spark plug torque specs?

Post by smwalker » Thu Oct 26, 2017 6:43 pm

CrashTestDummy wrote:Since you have differing metals working together there, I find using anti-seize is more important than using a torque wrench. It helps prevent galled threads and stuck plugs.
Make sure and use it sparingly though. Little goes a long way and keep in mind it does effect the torque specs. No factory service manual recommends the use of it. But it does seem to help at time of removal. Make sure and get the correct kind if you are going to use a little bit of it on the threads only.
Steve Walker
Azusa, CA
'11 PPV 9C3 Huron White

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