Canton Accumulator ??

If you opt for the electric valve, it closes when you shut off the car, maintaining the reserve oil capacity under pressure until next start-up.
Turn key, valve opens, pressure builds and then you start.

Doesn't do so much for valves and rockers without full groove cam bearings, but it's a godsend for mains n rods.

I'll install one if I ever build a motor that didn't involve a trip to pick n pull on the way to the parts store.