Pushrod Length

Mine ,did the same cold. Warmed up,went away. Magnum,stock valvetrain.,stock heads. Remember,high lift cams,ground on a smaller base circle.This means,longer push rods,are needed. Mind you,this isn't a flat tappet mill. .020" works there.I would shoot .030"-.050" pre load. These do not RPM,unless you spend bucks The video ,sounded like mine,until warmed up.