Not much different at .425 lift, but less false motion. I pretty much run them on everything. But I don't run anything but a 4 barrel carb and rev to 6,000 rpm. When you use good parts, longevity is a non issue in my experience. Most of my engines last forever with oil and filter changes at 3,000 miles and 20w50 Valvoline VR1. Actually I have never had one fail yet, except the cam and lifters in the stock 318, and that was a small tick at idle. To be fair it was a factory engine with 30,000 miles and it sat for years before I bought it. Fixed it with a small Mopar Performance cam and lifters, still running like new or better 20 years later...