Engine Break-in

340srule, flat tappet cams need to be broken in at a minimum of 1800 rpm (I use no less than 2000 rpm). This is because the camshaft lobes do not get pressure oiled, the only way they get oil is by the crank slinging oil on the bottom of the cam and on some motors, depending on the valley design, oil drain back. If your engine builder frowns on breaking in a cam this way you need a new engine builder. Just because he has not had a failure doesn't mean he is doing it right. Check with the camshaft manufacturers they will tell you the same thing, after all they made the cam.


Chuck