Has anyone used these lifters ?

True, modern cars are wonderful with their wizardry and computers.

Us cavemen and our stone aged mills get to employ tricks at best.

Most modern cars use some type of Variable valve timing (VVT) Rhodes lifters are
in effect VVT. With so many people reporting hydraulic lifter problems (China) why
not a USA product that actually works.
Too many so called hot rod gurus have over cammed mean sounding (idle) to
show at cruise night,which run like ****