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Does anyone know how much the cosworth high volume oil pump increases the oil pressure over the OEM oil pump?

The reason I'm asking is because I happened to install one of these when I built the engine that I'm currently running, and it appears to have an oil leak coming from the transmission side of the engine. I originally suspected that it was the rear main seal leaking and had it replaced, however the leak continued. After removing the IM and starter, I could see that the back side of the flywheel was dry and that the oil had been leaking down the side of the block around the starter cavity, so I'm now suspecting that the leak is coming from the oil galley plug that's to the top left of the RMS. I'm wondering could the cosworth oil pump along with a BSD have increased the oil pressure to a point where it is enough to get past the galley plug.
 
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