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I just checked Supertech's website against Ferrea's website, and the part numbers are completely different. In addition, the Supertech intake valves are black nitride coated, the Ferreas are not. I think your customer is confused as well, because Supertech doesn't put part numbers on the stem. My valves were not marked with a part number at all. Ferreas do not use inconel for the exhaust valves, otherwise they would say so. Inconel is a superior material in high heat applications, so it wouldn't make sense to not mention it if they were in fact using it. You know the super comp valves are a better valve based on what? The Supertech and Ferreas look COMPLETELY different from one another. The intake valves are BLACK.
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