Well I will go with DV's resume' and on the track results. Snake oil salesmen? I will go with DV, your results may vary. Other builders also have good and valid theories and practices. Sometimes we need to look on the other side of the fence for inspiration. Sometimes things work and sometimes they do not. An engine is a ton of compromises which can work together for a desired result or against one another. It is to achieve a suitable balance for your intended use.