New lifters require a new camshaft too because they wear together. Have you determined what failed and why? GM had a big problem with some camshaft lobes not getting oiled properly from the oil draining down that missed a couple of lobes, but that was back in the '70s. I'm sure they solved that problem by now. Lifters can fail to pump up anytime so mileage is not a concern. If a lobe wore away on the camshaft, it lasted 179,000 miles. No reason to expect any less from a new one.
Saturday, May 7th, 2011 AT 12:42 AM