my first thought would be oil slosh on braking. a lot of the modded pans Ive seen over the years concentrate on keeping the oil near the pickup on launch and during a run, but don't really consider where the oil will go under hard braking. is it a specific brand of pan or one that's been modded up?
One of the things I've seen/read about being done to decrease forward slosh was a hinged baffle that would allow it to run back to the pan, but act as a barrier in the front half of the pan to keep the bulk of the oil around the pick up. windage trays can also sometimes help depending on how its designed.
Losing oil pressure at the end of a run in the 1/8 mile can be a serious issue, as it can indicate a problem with the oil pump or the oil system as a whole. If the oil pump is not functioning properly, it can result in insufficient oil flow to the engine, which can cause the engine to seize or suffer other types of damage.
There are a few different things that could potentially cause the issue you are experiencing with your oil pump, and it will be necessary to diagnose the problem in order to determine the best course of action. Some possible causes of oil pressure loss at the end of a run include:
Worn or damaged oil pump: If the oil pump is worn or damaged, it may not be able to generate sufficient pressure to maintain proper oil flow to the engine.
Debris in the oil system: If there is debris in the oil system, it can cause blockages or restrictions that can reduce oil flow and pressure.
Oil level too low: If the oil level is too low, it can cause the oil pump to run dry, which can result in insufficient oil flow and pressure.
Oil pump drive belt slipping: If the oil pump drive belt is slipping, it can cause the oil pump to run at a reduced speed, which can result in insufficient oil flow and pressure.
In order to fix the problem, it will be necessary to diagnose the root cause and take appropriate action. This may involve inspecting and replacing the oil pump, cleaning the oil system, checking and adjusting the oil level, or replacing the oil pump drive belt. It is always a good idea to consult with a mechanic or a specialist for assistance in diagnosing and fixing oil pump issues.
Do you have a swinging oil pic up or stationary? Has the deep part of the sump been relocated? If sump been deepened did you extend the pick up tube? Has an oil pan baffle been installed to counter to counter oil slosh on the hit / shut down?
Just trying to help. GL buddy