Torque Specs for Spark Plugs

[bcfitzsimons]

Does anyone know how tightly you should torque spark plugs in an 8.1L?  I want to change mine now that I put Top End Cleaner in it, and I can't find a spec anywhere.

 

Thanks-Fitz

[bcfitzsimons]

And-by the way-can anyone recommend plugs for the 8.1?  Fitz.

[MarkD]

I've always used 25 ft. lbs., but I can't speak as to official 8.1 specs.

[bcfitzsimons]

I had figured anywhere between 12-25 ft-lbs, but I just wanted to make sure.  Anyone else?

 

Fitz

[westex39]

The old torque spec. was 15 ft. lbs. in the cast iron heads with the taper seat type sparkplugs.  I don't know the spec. for the aluminum heads.  I would assume it will be less than the cast iron.

[CMNTMXR81]

11lbs-ft.

 

Although 8.1's being cast iron heads NOT aluminum, you can get by with a tad bit more, say 15-20.

[Tucson_02Silverado]

2002 Silverado/Sierra Service Manual

 

Spark Plug Fastener Tightening Specifications

8.1 15lb ft

4.8/5.3/6.0 11lb ft

4.3 new heads 22lb ft

    used heads 11lb ft

 

 

Not to preach, but if anyone wants to do more than an oil change on their truck, they should invest in a service manual set.  Helm Inc.  5 manual set (2002 anyways) $120 part number GMT02CK8PU

[bcfitzsimons]

My thanks to all . . . .

 

Fitz.

[CMNTMXR81]

2002 Silverado/Sierra Service Manual

 

Spark Plug Fastener Tightening Specifications

8.1 15lb ft

4.8/5.3/6.0 11lb ft

4.3 new heads 22lb ft

    used heads 11lb ft

 

 

Not to preach, but if anyone wants to do more than an oil change on their truck, they should invest in a service manual set.  Helm Inc.  5 manual set (2002 anyways) $120 part number GMT02CK8PU

Better yet, get it on CD rom.

[Tucson_02Silverado]

The CD rom would be nice, and it is every GM manual set.  But it's $300

[BDBWTE]

Or you could always just screw them in hands tightness and then throw a 1/4 turn on it with a socket......it's just a spark plug.