no. before I did lifters it always leaked compression when cold, took the intake off and watched it bubble through some WD-40. but since I've done lifters it rarely misses on that cylinder. however sometimes it acts just like it did before I did lifters, making me think varnish on the valve stem (from when the lifters held it open) is still making it stick slightly. it sealed completely with the rockers off after I used a rubber mallet to unstick the valve. i have run mmo in the oil before I did lifters, but haven't run anything since I replaced lifters. when I have some free time I'll put some oil in the gas and seafoam in the intake.