Quote:
Originally Posted by jamesqf
Strange, then, that so many older cars seem to be able to run just fine on unleaded gas, and some have been doing so for hundreds of thousands of miles. When's this mysterious sinking valve problem supposed to show up?
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Can not speak for others, but I've had to replace valve seats in early Plymouth/Dodge 318 engines because the valves pounded themselves into the heat/seat...and personally know of similar problems happening with early Ford 6-cylinder engines...and, was TOLD (I know, 2nd hand) of similar problems with GM products.
Moreover, the private pilots were/are totally afraid of valve problems, hence their delayed transition to Low-LEAD (and NO-lead!) gasoline even now.
Today, the valve seat area of heads are inductively 'hardened' because of the loss of valve "cushioning" that lead-oxide (the end result during combustion) provided.