318 Build

Unless you have opened up or made additions to your oiling galleries I would strongly recommend a standard NEW oil pump, a high volume unit will have the bypass valve open pretty much all the time.

Even with the bypass open, pressure can increase and the extra pumping force required can be stressful on the oil pump driveshaft from the cam, if it fails it's all over red rover and time for a rebuild!

It's always good policy to open up the oil pump and check for faults such as poor machining or swarf which can cause an oil pump to be faulty or become blocked/restricted. You just never know!