OK I know what you've got. I had some of them and just sold them. I never knew the exact pressure rate either because I like you couldn't find it listed but I don't think they are all that stiff. That being said I don't think they should be your problem. The ones I have on my 360 now are at least that stiff and I had no problem with my generic cam. I thought just maybe you were running some big honking dual springs or the like. I'd say go with what Adam said and call the experts and see what they say. Sorry I couldn't be more help. Best of luck.Coyote Jack said