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You could use Honeywell VR8245M 2530 Universal Electronic Ignition Gas Valve 1/2" NPT Set for Nat. Gas with LP conversion kit & Honeywell S8610U Universal Intermittent Pilot Module. You will also have to change out the pilot assembly, to one that has a ignitor and a flame sensing rod. Honeywell part no. Q345A. You could use the pilot assmebly from a Lennox G20 "Whisper Heat" or the assembly from the G26 Series (earlier
models Dash 1)that had intermittent pilot ignition. I could ask Lennox to get a part number and price Monday (or maybe the have a changerover kit, with wiring diagram to be stuck onto the unit. If you want.

It should not be to hard to convert to spark
ignition. You will have to pull the burners to mount the pilot assembly. Find a spot to mount a stand off bracket to hold the ignition module, some spade connectors and colored wire, might need new 1/4" Aluminum tubing for the pilot. You probably going the burn up 1 1/2 to 2 hours labor per furnace. Cost for parts perhaps $180-$250.


Just went down town to my shop,
Found some books. Honeywell did make Y8610F5003 Universal Retrofit Intermittent Pilot Gas Burner Ignition system. That includes the module and VR8204 gas Valve 392431 ignitor/sensor assembly 394800-30 ignition cable,wiring harness w/
quick connect terminals .1005 shutoff if pilot fails,after 6 minute delay,trail for ignition is repeated.

Both Lennox G12 & G12E (electronic ignition) some with optional flue damper use the Duracurve heat exchangers. The G12E introduced in 1979. The G12 models had a standing pilot. How old are these furnace? Maybe you should have the heat
exchangers checked for cracks. Before sticking any money into them (furnaces). I don't know what you are going to save in the way of money per furnace, perhaps $45-$80 per year, by doing away with the standing pilots.
Some ulitilies may have these figuires.
Hope this helps. Some jurisdictions (codes) may not allow you to convert this appliance over to intermittent pilot system, because the wiring diagram doesn't correspond to the retrofit.


John Boy