ClassicCar

I have the original WDO on the 49 C 6, and a WGD on the 52 8. Have rebuilt them both. The brass anti-perc valves tend to get sticky on the WDO and starve the engine if it sets for a few months. The WGD has a different arrangement for anti-perk



It appears that the WGD was a little simpler, less trouble-prone and less expensive to make, which is probably why Hudson switched over to it.



Your engine will run great with either one if they're clean and adjusted properly. If it doesn't, your problem is elsewhere.



By the way, Geoff Clark says to set the float 1/8 lower than spec because the new gas has a lower specific gravity and will rise too high in the float chamber. Fixed my stalling on a hard or downhill stop.