Ferocity02

iTrader: (60)

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!

Gev

snug plus a little is good

Ferocity02

iTrader: (60)

How does 21 ft/lbs sound?

jrp

iTrader: (16)

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.

silverTA

14 ft/lb or finger tighten then turn 1/16 turn

RPM WS6

iTrader: (3)

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.

Ferocity02

iTrader: (60)

Ah, on the box of NGK's it said 18-21 ft/lbs

RPM WS6

iTrader: (3)

That's nearly twice what GM recommends. I wouldn't do it....

Ferocity02

iTrader: (60)

Ok, I put mine to 12 ft/lbs, thanks guys!

deepstuff

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?

G Atsma

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.

99 Black Bird T/A

iTrader: (4)

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.

sjsingle1

iTrader: (1)

dont forget the anti seize !!

scout2000

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?

Chris Paveglio

iTrader: (2)

I can't get a tq wrench on the ones in the back half anyways.

sjsingle1

iTrader: (1)

I just use the silver anti seize ....permatex

scout2000

Thanks. Assuming this is what everyone uses.

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

appreciated.

99 Black Bird T/A

iTrader: (4)

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.

scout2000

product link for validation

zachm89

iTrader: (14)

13.5 year old thread...this one might be a record.