Our small block has seen up to and over 9000 rpm's We shift tit a 8000 consistently. We use standard shaft oiling, But. This mod must be done if using studs and not the tapered bolt that allows oil up through and around the bolt. Simple fix if studs are in the engine already, The stud must be clocked and marked for that hole and installed to the same position to allow oil up the passage. One stud on each side.