John has also improved the seals and the impeller (which was ripped off by guess who). He has experimented with different ball material. The biggest problem though is the races. My son worked for John for several summers and John is the reason he is a mechanical engineer. Jake's super charger has several of John's improvements. Quite a guy even if you don't count the Keith Black and Silvo-lite pistons he designed. He is working on a bunch more stuff now for Stude V8s.
