Correct o-ring for LB7 thermostat housing
This is the big o-ring that connects the top, rear side of the thermostat housing with the metal portion of the upper radiator pipe. This is not the seal that goes to each thermostat, but I would recommend buying this if you are changing the thermostats on an LB7. Clean the mating surfaces well and use plenty of dielectric grease prior to install to prevent tearing or degrading the o-ring.
Bottom Line Yes, I would recommend to a friend
To big did not fit
Did not fit my 6.2L to big in diameter
Bottom Line No, I would not recommend to a friend