I bought a Hughes HFT cam and lifter set in 2000 that was still going in 2004,when the cam dropped lobes. My fault; that was right after an oil-change, and I learned about ZDDP.
Next cam was one size bigger and again a new set of Hughes and their "better" C-clip lifters." That second cam now has about 50,000 miles on, with no trouble.
I don't recall what my spring pressure is, but the engine goes 7200 and more.
