428street Between 45-60 is a large range at a steady rpm. Is this new
oil or old
oil? If you are running a HV
oil pump in the motor, add 1 quart more than what is called for. The problem is the returns from the heads and block to the oil pan, are slow. A HV pump puts out about 30% more oil than a standard pump. This should also stablize the pressure readings. Do you know if there are limiters in the heads to control oil to the rockers? If not you may want to add a holley jets of .090" to each head. This is for a street motor. For the track an .080" would be fine. Cruising at 2,000 rpms and steady, you want to see a steady reading with maybe a 5 pounds high to low. Any thing more than 10 psi I would be getting another gauge to check out the one in the car. The oil pressure may be fine but the gauge could be off in calibration over time. There is a 10-20 psi differents between the reading you get at the oil filter plate and the heads. As long as you don't hear and rocker noise you are OK. I run a bottle of lucas oil suppliment. I think this helps keep the oil on the parts longer and stops dry startups. You just have to pour it in slow with the motor oil being warm and the engine running. I don't let my motors idle for a long time except when warming up to run. What weight oil are you running? you might want to go 1 range up for the summer months. Rick L.