The dinosaur is gone
Today I change a Lennox g8137 furnace> the damm thing had the original gas valve and other controls. Only the blower motor was changed.
Serial number was 66-12. Now this is well befor my time, havent even seen a g8 for 12 years and am not sure if the 66 is the year.
I also changed the Honneywell T90 stat with the lennox name on it.
Here is the catch. no visible cracks in the heat exchaner in the normal locations. If it was a g12 it would have been done.
Home owner opted for a 80% but its still going to save some decent money
real steel in the HX..............not that crappy stamped stuff
I still service gravity or retrofitted gravity furnaces that are 2-3 times older then me, built in the early 40's cant crack a steel heat exchanger it seems. Cost an arm and a leg to run too.
I always thought the G12 was steel.
G8s were manufactured in canada until the early 90s. (design probably revised a few times - larger blowers for a/c and electronic ignition)
standing pilot, belt drive on this baby.
lennox would be so proud