Actually 25-30% 100LL should give you enough lead for valves, but that is only a temporary solution as 100LL is being phased out or getting increasingly difficult to get. The FAA has approved STC's to allow most general aviation aircraft to run on Autogas. I question some of the valve seat recession wisdom. John Deere offered propane 1010s did they have hardened valve seats 'cause propane has squat for lead, what about all the old distillate engines-did tractor fuel or distillate or TVO have lead? Last month there was a big discussion about modern fuels causing problems with red tractors with six cylinder engines, work 'em hard on autogas and they melt pistons. I've seen air-cooled engines (VWs and some Kohlers) having fuel related issues that caused exhaust valve failure, the seats were fine but got some stretch on the exhaust valves. This was when leaded gas was still available, a root cause was the engine running a little to lean. Back in the air-cooled VW's heyday a common cause of death was breaking #3 exhaust valve, the valve would stretch a bit, where the stem got thin it would break and the the valve head would bounce around in the cylinder spreading hate and discontent. It was always #3 because it was tucked in behind the oil cooler and ran a little hotter than the other cylinders so when you pushed it out to the edge #3 gave up first. If you were "lucky" some times you'd loose a small enough section on the valve face to not screw up to much before you got it shut down.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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