Be very careful as you tighten the spark plugs....I use a socket with an 8 inch extension with a the sewival at the top of the extension and I use a spark plug socket..(not really nessary.) I use a 3/8 inch piece of fuel line to start the plugs in the hole. FINGER TIGHT.
just finger tight with anit-sieze
then grab your torque wrench.
Actual torque range is 7-14 foot pounds or 85-170 inch pounds.
My recommendation is to use an inch pound torque wrench for two reasons..
One my foot/pound torque wrench is like 28 inches long...way too big for spark plugs.
Also 7 foot pounds is at the extreme low range of a normal foot pound torque wrench where its possilble to get erronenous readings.
Go spend the $60 bucks at Sear's for a good little inch pound torque wrench, they are about 16 inches long...much more manageable and accurate for our fragile aluminum trends. I torque to 120 inch pounds..roughly 10 foot pounds, thats in the middle of the range. I would not go any lower than 10 ft/lbs or any higher that 12ft/lbs. Remember 12 ft/lbs is nothing..its a very low torque number...so no Gorilla action here. You probably think they are tight enough..so that will mean they are just right
Be careful.....you can search and find many horror stories or people stripping out their heads. Dont force the plugs..just use the fuel line to start them in the hole and you will just fine. If you feel any resistance stop, and determine the problem. My piece of fuel line is about 12 inches long just right with the plug stuck in it and in the head you have a few inches left to spin the spark plug in.
