Me thinks the required spring pressures determine the life of the lifter.I found out the hard way.I'm on the same set of comp 848's since March of 04.Rebuilt for the second time last winter.
My lift is mid 6s with spring pressure low 600lbs over the nose in a street driven hemi that sees over 1000 miles a year and if I'm lucky,,,,,60 passes.

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HEMI-ITIS has no cure.
My condition is fully BLOWN!!