Check out Howards Cams. They have a selection called "Max Certified" in the cam/lifter packages. They run them through an additional cerification process to ensure the QC of the items. This line of units gets a 5 year, no questions asked warranty. I'd been looking at one of their other units for the 440 I'm putting together for my 67 wagon. When I saw and verified that the unit I was wanting, Torque Monster, was in this selection too, I ordered it. Have not run it yet in case anyone asks. Next year sometime. Check them out.