Dyno’d my hemi the other day and noticed a slight drop on pressure at higher rpm. Wanted to get some thoughts.

4.5” stroke
Charlie’s oil pan (10qts)
Single line with milodon pump
Crank scrapper and windage tray
Added returns to the oil drain backs to get them below crank

Time for a dual line? I ran the pan and pump previously with a 4.15 crank and use to shift at 7k. I never dyno’d it or paid that close attention to what the oil pressure did during a run. That motor ran for years and bearings always looked great.