Bruce, it's been years since I had two side by side to compare, but if I remember correctly, the all-fuel valve is close to the same port size on both flow through and by-pass as compared to the gas. The gas one has quite a difference in flow-through compared to by-pass. I think because they wanted the all-fuel to be hot versus hotter all the time, where as the gas needed to be REALLY cooler on hot weather.
I believe you could modify a gas valve to be an all-fuel valve if you wanted to grind and mill, if you had a broken all-fuel valve to go by.
This post was edited by F-I-T at 18:09:49 11/29/12.
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