Stainless Works Chevy Silverado/GMC Sierra 3/4 Ton 2004-07 Headers - Manual (Page 3)

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3. Place a small bead of RTV around each port on the headers and install each from
under the vehicle. Tighten nuts to OEM specs. Install O2 sensors with 8” long
extensions in headers. (Note: with the larger tube sized headers - 1-7/8” or 2” dia
primaries, there may be insufficient clearance around the steering shaft. Loosen
the motor mount bolts, jack up the motor a bit and slide the motor toward the
passenger side of the vehicle to provide a min. of 1/8” clearance for the steering
shaft. Retighten motor mounts.)
4. Using new 3” clamps (3), install both leadpipes to headers and to factory flange
for passenger side.
5. Reinstall the hanger off the transmission for the leadpipes.
6. Reinstall transmission cross member.
7. Be sure to have adequate clearance around all wires, hoses and lines. If anything
is in contact with the exhaust system, it will melt. Make sure to have at least
½” of clearance and wrap any suspect areas with DEI thermal barrier wrap.
8. Lower the vehicle.
9. Reinstall dipstick tube locating tube to manifold stud (just below original
location) and use extra nut to hold in place.
10. Reinstall spark plugs, wires, air intake, steering shaft and reconnect the battery.
11. After double checking for clearance and making sure all lines, wires and hoses are
secured, drive the car for 10-20 miles and re-check all clamps and clearances.
Your system may be tack welded at the joints/ clamps to reduce shifting of the
system during heating and cooling cycles. Make certain to disconnect the battery
before performing any welding.