Originally Posted by Guy Hiltz
If you are looking for long term longevity you might want to shy away from an off the shelf street series Comp solid roller cam,turns out they arent made from billet steel as I had thought they were, but are made from an austempered ductile iron which has a hardened surface that can wear.If it has an 8 as the last part number this is what it is.I went from an older Crane solid roller to the XR280R Comp grind and was a bit dissapointed,it lost on the bottom end,had a bit more on the top end,but sure didnt feel as good.I`m going to be changing cams next rebuild and I dont think I will be using another Comp Cams product.
Tell us about the rest of the engine and vehicle combination.
What was the old cam duration vs new? Lobe separation old vs new?
Was the cam the only thing you changed?
I just recently received my CS XR280 R-10 and called Comp with your same concern, they said: "if the open spring pressure at max lift is less than 500lbs, its not a problem". I went with 110 lob sep due to the weight of my truck.
So 65Guera if idle quality is not a concern consider the XR274R (or brand XXXX with similar advertised numbers) ground on a 108 or even a 106 lob sep to help wake it up.
But the best advice is probably right in your own back yard: http://www.joeshermanracing.com/