LG Motorsports LG Pro Long Tube Headers - Manual (Page 6)

Figure 9: Install of Driver side header
Now install the header on the passenger side to start the rest of the install. The
header should install from the bottom up. We also only recommend using GM header
gaskets for the 2000 LS1 Camaro/Corvette as these use the same port design as the
headers and have proven the best seal.
Figure 10: Passenger side header installed loosely with gasket
Once both headers have been installed and all bolts started. You can finalize by
now tightening down all header bolts working your way from the middle out to the ends.