chas427fe Chas 10#'s is alot if this is just an
oil swap and filter. When you first start the car does the needle pin to 60 psi+? Is the problem with the
oil pressure only after the motor is hot and been running for a while? I have 2 thoughts on your problem, bad gauge or problem in the motor.
. Wb has the easiest idea, get a good mechanical gauge and retest the motor. If the pressure matches the gauge in the car, you have motor problem.
I would start with the rocker arm studs or bolts and make sure they are all still at 35 ft. of torque. If this is good I am pull the
oil pan. Do you have an old filters from the motor? If you do, cut one open and look for metal partials in the pleets. If the answer is yes, time to pull apart the motor and check for damage. If not, I would look at the oil pump and pressure nipple in the puymp to be seated. It is easy for it to get stuck a little open and bleed pressure off the system. You might or might not see any thing. A cheap way would be to replace the oil pump with a blue printed one. I would go to Doug and buy a blue printed one with a 70-80# spring upgrade.
I don't want to get into a oil pressure issue on the forum. IMO and 14 years of racing an FE based motor, SBC numbers are not enough. 10# at idle might be OK IF it's a 427 crossdrilled crankshaft. It is IMO way short on any FE motor. You have 10# at the gauge which means you have a dribble at the rockers and maybe 2-5 psi at the rear rods. When you pull the pan check #4,#8 rods for play and rod bearing clearance. These rods get the oil last. Check the rest if you have the time with plastic gauge. Make sure all bolts or nuts are at spec, If not you have a problem starting. You also might want to look at a oil suppliment like Lucas. It has a clinging additive to help dry starts. Even better is adding a 2-3 quart accusump as a per oiler for the motor. Been using one for 8 years. It's nice to have 30-40 psi of pressure before cranking the motor. 80% of wear and tear on a motor is done at startup.
Hard spirited driving could have cause low oil pressures and you might have not seen the gauge drop to almost "0" around a high speed turn and pull a little "g". The other thing is overfill the oil system 1 quart because of the HV oil pump. It pulls 28% more oil than a stock pump. It is possible that you may have sucked the oil pan dry because of the slow returns on the motor. Try gauge first and hope for the best.
If no change add more info. Rick L.