My Haynes book indicates the proper spark plug torque is "84 to 168 in-lbs".
What is this in "ft-lbs"? Is it a simple matter of dividing by 12?

 

Yes. 7 to 14 ft/lb

 

I found it very tough to measure when installing the back plugs, with the swivel connected. I just cranked them down by feel.

 

I was told the spark plugs in the V-10s were rated to last 100,000 miles. Was there a specific reason you changed them, or are you like me and don't chances?

 

Ive read several threads that suggest changing them at 70,000. I haven't done it yet, but am seriously considering it if for no other reason than to just know it's been done. I haven't had the truck but a few months.

 

I replaced mine at 80K just because I wanted to. They looked like they needed replacing. They had a pretty hefty gap. Torqued them down to wrist tight. My wrist 'clicked' so I know I was dead on.

Pete

 

One grunt will suffice...

I know everyone says "foot lbs" or "inch lbs" but have you ever wondered why??? It should be lbs foot. Load first then the distance required to do the work...

 

Wow, you do what you're talking about gmsux! For the rest of us torque is measured with a dead wight at a specific distance ford the center of the axis that is being torqued. IE one foot pound is a length of one foot and a weight of one pound hanging parallel to the earth.
John

 

A link I keep on my desktop is this: Energy and Work Conversion - FREE Unit Converter Very cool for a lot of things--plug in your numbers existing or desired, units to be displayed and bingo, no math required!

General point though about plug---they barely last 50K miles and anything above that costs you MPG's. Have a look at a set supposedly with 65K miles:

Decide for yourself. FWIW I torque mine to about 22 ft/lbs or lbs/ft, also your choice but my torque wrench isn't that particular about such things! I do use nickel-based anti-seize too, also another option and/or choice.


HTH