340 Cam Change - Lunati vs. Comp.

All solid orllers need regular rebuilding. Some on milder cams (and the matching milder open pressures) will go longer. But eventually all will need at least inspections. Plus, if the original builder used the right springs, but the springs tired over the season (a good race cam will need springs inpected every season or more often depending on the cam and rpm range) there can be harmonics issues that will tear up everything.

Back to MRL's post... If the parts failed it is FAR more likely to be builder error than parts quality. Not saying it doesn't happen, but it's not often at all. If the engine was raced you never know what was done to the. It could have been overrev'd just by hitting the wrong gear in the lights, broken driveline, etc. So there are not usually any warranties with them, and if they do help, it won't cover the cost of the engine, only the part they made.