Definitely a drag...gonna expose my ignorance; how did you tell? What are the symptoms of gradually wiping out a lobe or lobes? It concerns me as I like the tappety tap of a FT valve train and ignore engine builders plea to drop compression and go roller as they just don’t sound the same. This 429 SCJ waiting for reinstall is bone stock,11:3-1 compression FT, for street use. I too switched from rotella years ago and use the VR1 high zinc 20/50 as i rarely start the cars below 50 degrees and want the extra viscosity for the heat. I find topic concerning as I spoke to original owner of my Z28 and he rebuilt the motor in mid 80s. He boosted about the high valve springs pressure he used on the Crane version of Duntov’s 30-30 FT cam. Says it’s good to 8000 rpm. Sounds like a recipe for wearing out a cam. About 15k miles on my motor.