oil pump

You have several choices here. Stock is for granny cars with a 4 QT pan . High pressure is for loose clearances and a 4 1/2 qt pan or larger. High volume is for performance engines on street or track . However a high volume pump MUST be accompanied with a large volume pan or there is a danger of sucking the pan dry . Lastly, high volume/high pressure is for all out racing. Remember: high pressure is the RESISTANCE TO FLOW, not how much oil is getting where it needs to be. Good luck !