Good call. I would also put it back. It's just a flow restrictor that limits oil flow to the head so the bottom end still gets oiled sufficiently and also an anti-drain back to keep the oil passages in the head, cams and lifters filled up. Prevents lifter tick at start up. __________________ 1996 Ti 280k miles and still going.... 1993 964 - holding on to this one 2001 Burban, 240k miles 2018 Suburban Z71 |