Normal oil PSI range.
 

So today was the first really nice day this year and I got the Cobra out. My first chore was to change the oil. I was very excited because I hadn't actually driven the car yet except around the block when I bought the car this past December. So today was the first drive.........I absolutely LOVED it!!!

At any rate, I was wondering what the normal PSI range for the oil is. When I first started the car it was around 60-65. I can't remember exactly what it was when it finally warmed up but it seems it was around 15-20 at idle and maybe 35-40 when I was driving.

I will get actual numbers tomorrow, what is the typical range?

Also, on a second question, my engine is a 1967 428. How many quarts of oil does that engine hold? I was nervous that the dipstick was inaccurate when I was filling it back up.

There is quite a bit of variance from engine design/build specs. When my 482 is first started, the pressure at 1000 rpm is around 80psi. After the engine oil is hot (80-100 degrees C) my idle pressure is 35psi and at 2000 rpm around 60psi. When redlined, back to 80psi. Hope that helps. BTW, I use Amsoil 20w50 full synthetic.

The old rule of thumb is 10 psi per 1000 rpm. Sounds like you're good to go.

The most common FE oil pumps have a relief valve at 60-65 psi.

The oil capacity will be dependent upon which oil pan you have.

It's not that easy
 

Donkeykong Here's a couple of quick questions,
#1 what oil are you using, 5-30,10-30, 10-40, and the list goes on
#2 what oil pump is in the motor, standard, HP.,HV., HPHV., Blueprinted
there are about 6 different spring pressures for the pump.
#3we don't know who built the motor and what clearances where used
#4 valve train used and any oil modification to the heads and block.
#5 Clearances of bearing on the bottom end?
The 10 psi for every 1,000 rpm is for a SMALL BLOCK CHEVY MOTOR not an FE. SBC motor have wide bearings and 200 less grams of rotating mass.
#6 oil pan, which one are you running? stock 5.0 quarts, upto 7.0 quarts race pan for 1/4 mile. "T" oil pan which holds about 7-8 quarts. After market which could hold upto 12 quarts. I tell anyone running any motor to overfill the motor by 1-1.5 quarts. Ford FE motors have slow oil returns from the heads. This is a whole other thread.
Kong it sound like you got a nice car without any real info on it and specs. The 2 points I will give to you is that the oil pressure reading you see on the gauge IS NOT what the heads are getting. There is a 10-30 psi drop between bottom of the motor and top. Don't allow the motor to idle long. Point 2 look into an accusump as a pre oiler for the motor and to help keep oil pressure up on high "G" turns. Rick L.