Quote:

I built a 500" RB for a customer, (stock block) and used the oil pump that was on the old engine. It's a Melling HV oil pump with a Milodon cover, single external line from a Milodon static pick up. When I primed the engine new, it had over 100 lbs of oil pressure. I replaced the oil pump regulator and spring with a new one from a Milodon overhaul kit. That brought the oil pressure down to about 85-88 lbs with a drill and priming shaft. I'd like it around 70-75 lbs idling. Whats the best way to bring this down?

Thanks,
Brian



That pressure will be considerably less once the oil is up to operating temp. Let it warm up and see where you're at.

75 PSI seems like a lot of pressure to me but if that is where you want it at hot idle, depending on how fast it idles, you may be putting the other spring back in.

Kevin