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The sodium valves were OEM in the side oiler and were the achillies heel in the valve train. I think the manufacturing processes at the time led to the potential of having the stem fracture at the underside of the valve. The theory is that the sodium helps disipate some of the heat in the valve. Metallurgy marched forward and different alloys of Stainless were used for the valves as was Titanium in some types of racing but the wear on the seat and valve face limits Titaniums usage.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
Last edited by Rick Parker; 12-21-2006 at 09:39 AM..
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