High lift cams and strong valve springs substantially increase the loads on the tappet rollers, which can lead to failure of stock components. Then the broken needle rollers will likely destroy your oil pump and the deformed roller will damage your cam lobe. Ultimately, a complete engine tear down and oil system flush are required to remedy this. The Powerglide Steady Roll tappets have the needle rollers replaced with a special bronze alloy bushing and the improved roller attached to a proven “Powerglide” tappet. This combination results in significantly increased reliability, longer life and quiet operation. The failsafe design means even if the bushing wears out, it will be retained in the tappet assembly.