Have you had the distributor out? The oil pump is driven by a "key" on the end of the distributor. If it isn't engaged you don't have oil pressure.

You can check the oil pump by removing the distributor and turning the slotted chilibob you'll see at the bottom of the hole. (It's the top of the pump.) Be sure to have the engine sitting on TDC when you pull the distributor and note the position of the rotor. You'll have to put it back in in the same place.

Do this while you have the valve cover off for the valve adjustment. Use a ¼" drive socket that will fit in the slot and a long extension chucked into a drill motor. Be sure to turn he pump in the direction the distributor travels. You should see oil flow at the rockers.

Don't let the socket fall into the engine.

"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.