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Generation III External Engine
LS1 | LS6 | Bolt-Ons | Intakes | Exhaust | Ignition | Accessories
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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 01-01-2004, 03:12 PM
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