I`ve been running a solid Isky roller for almost 5 years and changed springs once along w/a bronze gear both just for piece of mind. I`m on the same set of Isky solid body drop in lifters and run their rollerized cam button touching a stock timing cover............a few thousand miles later all seems well and thats w/.680-.660 lift and 275-280 degs. dur @ .050.....mileage sucks but what a blast to drive.