found this article on our site about oil pumps . I bet I was sucking the oil pan dry because this engine took so long to rev up.>>> High pressure requires a stronger intermediate shaft (and sometimes a drive gear change)
High volume can starve the engine for oil at higher RPM's due to pulling the sump dry before the oil can get back down into the pan again.
A standard pump can have not enough flow and pressure for a loose engine.
For a regular performance street motor a standard pump is totally fine.