I need to swap out my rear knock sensor on my 4.8L.
My questions are what are the torque specs for the sensors and intake.
And is there anything I need to know about doing this like draining the rad.

 

You don't have to drain the radiator. Just pinch off the line that goes into the throttle body. Torque I imagine would be about 18lbft but I don't have the spec. I am a tech and that is a safe torque for those. Intake torque should be about the same if not 22lbft. Sorry don't have specs but you will be safe with that. Be carefull of the Oil Psi Sensor in the rear, easily broken if your not carefull. Hope this helps. Oh and if you have a decent cam, you can wrap the threaded part of the kock sensor with teflon tape. It helps keep if from picking up knock and retarding the timing. Feel free to correct me if I am wrong fellas.