The valve your referring to is not the relief valve, but is an anti drainback check valve. By plugging this portion of the passage you put all of the oil thru the filter (full flow) rather than bypassing a small portion of it. There were several reasons for doing this in the older engines, but with todays oils you will get better performance if you plug this passage. Power Play can help you out with this. I use a stock oil pump with spin on oil filter and it has oil pressure as soon as the engine cranks over. Brian [Non-text portions of this message have been removed]