I ran two of Daves cams in small blocks, a hydraulic and a flat solid, both made good power. Both engines were ran five years, when the engines were tore down both cams were worn on the nose of the lobe and had porosity on several lobes. I used good oil with eos added, and Hughes recommended springs. For what it's worth Ryan Johnson told me later that he didn't like their springs, said they didn't hold up well. I now run a solid roller.