I mean really ?!? Plastic cam AND plastic lobes ???? But how much weight and money is Briggs saving here ?!?! Planned absolesence.....what a disgrace. Disposable mower engines now. Just threw out a trash picked 1972 Briggs push mower. Ran it for 7 years. Smokin like crazy, blow by was insane, piston rod rap was so loud, it was ridiculous. My neighbors hated it. Frig em...LOL . Got to the point where I was runnin pure STP oil treatment in the crankcase. I said, ok, this is enough now. Costing me more in STP than gasoline. Wheeled it out to the trash. I BET there was not a single piece of plastic in that engine to run on pure STP blue bottle. It would have never taken the abuse. Now, that was an engine !!!!!!! Now I have some 1/2 plastic P.O.S. from Home Depot, with a Briggs on it no less.