Do you have to bleed new lifters?
Do you have to bleed new lifters? Yes. It's good practice even if they're new. You are bleeding out any oil to make sure they can be fully compressed. If not, there is the possibility of them holding the valves open. Why does a cam go flat? Flat tappet cams are susceptible to damage due to a lack of zinc in modern engine oil, causing drivability problems as the lobe wears down. Flat tappet cams can be damaged by using modern engine oils that lack zinc and associated anti-scuff additives. What should I do if my Mopar lifter makes noise?...