This is one reason why I chose the camshaft I did for Vixen's engine. It's only .465 lift. I wanted to keep the lift low, so as not to run into any problems having to use a spring with lots of pressure. I knew it would last a long time. Even though the engine isn't stock and sounds pretty nasty, it won't hurt a thing and should last a very long time. With the exception of going around and tightening bolts from time to time. lol It's been a little over three years now and she's still runnin fine. I had an old guy I worked for as a kid say once that a true high performance engine only lasts about a year or so before it needs to be refreshed. He of course was talking about old school high compression, big cam builds and in a lot of cases, he was right. Higher than stock cylinder pressure, camshaft lift, valve sprAng pressure can all lead to lower than stock life expectancy. Especially when the end user mashes the loud pedal a lot. Just one more reason I just love to cruise old Vixen around and have a good time. Hopefully for a long time.