Does anyone make high quality replacement hydraulic roller lifters with MDS to replace the factory lifters? I believe the Hylift Johnsons are non-MDS only lifters. Looking for some stock replacements with MDS that are much better than what comes from the factory. I believe the factory lifters are made by Melling. I heard that Melling did a redesign of the lifters and that they are better than the originals. I don't know if this is true. If it is true, I don't know how much better they are than the original factory lifters. Isky makes a hydraulic roller lifter for the hemi that uses a bushing rather than needle bearings. I'm sure they're pricey, but would probably go a long way in solving the failure issue (unless you believe the cam is the cause). However, I believe that Isky's are non-MDS as well. Any insights/recommendations would be most appreciated.