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How tight do I tighten the spark plugs?

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Old 12-31-2003, 09:44 PM   #1
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Default How tight do I tighten the spark plugs?

I'm just wondering how tight the spark plugs should be installed. Are there torque specs or is it just by feel? Sung? Snug plus a little... ect. Thanks!
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Old 12-31-2003, 09:48 PM   #2
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snug plus a little is good
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Old 01-01-2004, 01:30 AM   #3
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How does 21 ft/lbs sound?
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Old 01-01-2004, 05:08 AM   #4
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Quote:
Originally Posted by Ferocity02
How does 21 ft/lbs sound?
way too much, i forgot the exact tq specs but i just hand tight mine and then do a 1/4 turn past that. remember, the heads are aluminum, you dont need to tq the **** out of things on them.
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Old 01-01-2004, 08:50 AM   #5
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14 ft/lb or finger tighten then turn 1/16 turn
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Old 01-01-2004, 10:55 AM   #6
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11 ft/lb is the spec in the GM manual for LS1 heads, unless they are new heads. First time plug install on new heads is listed at 15 ft/lb (factory first time only), but all following installations should be 11 ft/lb.

Honestly I don't use a TQ wrench though. You get used to the feel. Just a tad past tight is good.
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Old 01-01-2004, 12:23 PM   #7
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Ah, on the box of NGK's it said 18-21 ft/lbs
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Old 01-01-2004, 01:38 PM   #8
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Quote:
Originally Posted by Ferocity02
Ah, on the box of NGK's it said 18-21 ft/lbs
That's nearly twice what GM recommends. I wouldn't do it....
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Old 01-01-2004, 03:12 PM   #9
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Ok, I put mine to 12 ft/lbs, thanks guys!
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Old 06-28-2017, 07:36 AM   #10
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Anyone know the torque spec for plugs in Aluminum heads, 2007 L76? Is it best to try and get the old ones out with engine cold or hot?
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Old 06-28-2017, 10:00 AM   #11
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The torque spec shown in posts above IS for aluminum heads. Nearly ALL LS heads are aluminum. The exception is some 6.0 truck heads from around 2000.
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Old 06-28-2017, 02:54 PM   #12
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Quote:
Originally Posted by RPM WS6 View Post
11 ft/lb is the spec in the GM manual for LS1 heads, unless they are new heads. First time plug install on new heads is listed at 15 ft/lb (factory first time only), but all following installations should be 11 ft/lb.

Honestly I don't use a TQ wrench though. You get used to the feel. Just a tad past tight is good.

I use a torque wrench and do 11 ft/lb per GM spec. No issues on the 99TA and it's had like a dozen plug changes. A little anti-seize helps too.
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Old 06-28-2017, 02:55 PM   #13
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dont forget the anti seize !!
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Old 06-29-2017, 02:57 AM   #14
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OP, thanks for kicking off this thread, I needed that info also.

Regarding anti-seize, any type in specific to use with aluminum heads? Or....any anti-seize specifically not to use?
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Old 06-29-2017, 11:15 AM   #15
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I can't get a tq wrench on the ones in the back half anyways.
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Old 06-29-2017, 04:44 PM   #16
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I just use the silver anti seize ....permatex
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Old 06-29-2017, 07:42 PM   #17
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I just use the silver anti seize ....permatex

Thanks. Assuming this is what everyone uses.

I'm a little old school, and this is my first LS engine.

appreciated.
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Old 06-30-2017, 06:23 AM   #18
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Quote:
Originally Posted by deepstuff View Post
Anyone know the torque spec for plugs in Aluminum heads, 2007 L76? Is it best to try and get the old ones out with engine cold or hot?
I've always done my 99TA with the engine cold or maybe slightly warm.

The LSx engine plug changes aren't anything like the horror of prior generation Ford Mod motors eating spark plugs for breakfast and regurgitating $1,000+ repair bills on a regular basis.

My girlfriend's son spent $1,800 to get the plugs changed in his 06 F150 Triton 5.4 changed because they all broke. Didn't matter at all the change was attempted hot. He was lucky they could all be extracted. A coworker spent $2,400 for a plug change on her 4.6 Mustang when one plug broke in each head and part of it fell into the cylinder. Several others broke also etc. Both heads had to be pulled.
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Old 06-30-2017, 11:01 AM   #19
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Quote:
Originally Posted by sjsingle1 View Post
I just use the silver anti seize ....permatex
product link for validation

Amazon Amazon
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Old 06-30-2017, 01:18 PM   #20
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13.5 year old thread...this one might be a record.
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