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bernia Mike there are nascar springs and they are made different than the over the counter ones they sell. Tech knows about them. Every gram of wieght you can take off the valve assembly will give you 2-300 rpm. the limit was 68-6900 rpm. The valve gets bouncy and will not seat, power lose. Same of this depends on cam profile and ramps. Titanium valves you can't runon the street. Talked to the 4 major valve companys, heat cycles is why they break. Yeah I found one guy that has 12K on them and no problem. The seats have to be of a harder material than what comes in the heads. For drag racing, this is the way guys are going for street, not recomended. I asked about coating for the valves and heads, on the valves they will last a little longer but you loose air flow(cfm) If keith is using a longer valve and going 2.090 height you would have less seat pressure on the valve but more lift could be used on the cam but you still need .060" for coil bind. Comp said they have had a couple of broken valve springs, but this is due to improper installation or binding of the spring and a over coil ride happens. If Keith is running higher heights on the valves than you need different lenght push rods to keep the rocker centered on the valve top. Some of these techs also recommend valve caps for the tops of the valves. Rick Lake
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