i just bought my very first mustang its an 85 gt the motor had all of the smog stuff ripped off and i am getting a serious amount of blow bye so much that if i dont take the oil fill cap off of the valve cove it blow oil up through the dipstick tube due to the crankcase pressure building up also when i start the car the oil pressure is at 40 psi when it warms up the pressure drops to around 5-10 psi and goes to 20 psi when driving it on the highway i dont know if its because the motor is tired or if its doing this because all of the smog equipment has been ripped off any info would be greatly appreciated thank you

shawn

 

If you are going by the stock oil pressure guage, don't believe it. They are worthless. On the other hand, it could indicate a problem. If you can, you may want to get a better after-market guage and see if you see those swings.