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The
basic work necessary for a lead-free conversion is to replace the old exhaust
seats with new silicon steel pre-machined rings strong enough to withstand
the additional heat of unleaded petrol and the lack of lubricating properties.
Due to the heat of combustion, your exhaust valves and seats are almost at melting point. As they slam shut they can literally weld themselves together wearing out. Some vintage vehicles require new replacement stainless steel valves to match. Although not absolutely required, it is also wise to re-cut your inlet seats to better than new and re-face your original valves. We do this to F1 standards on Serdi equipment to perfectly matching angles. It also makes sense to line your guides to close tolerances for the sake of longevity. Why? See our page on K-Line Guide-lining. |
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