Tractor Rob said: (quoted from post at 03:43:22 11/01/09) I could really use a recommendation on an additive
for a 1950's 4 cylinder engine. I understand a
valve job is almost inevitable.
Lead in gasoline was used to "lubricate" the seats. This was especially important with the intake valve which were not hardened to the same specs as the exhaust.
Problems can be encountered with the valve receding. A lot of money was spent on older engines to add hardened intake valves and seats and in most cases it was unnecessary.
It all depends on how the engine is used. For example, if the engine is in a large truck that is always hauling a load and the engine is under great stress, you could have a problem.
On the other hand, I you have a tractor or a regular half ton truck that is occasionally used to haul great loads, you probably wount have a problem.
I have a 1977 Dodge W100 4X4 truck that I have owned for over 20 years and I have never encountered a problem.
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