12mm Modified Oil PumpModified Oil Pumps will improve oil supply through your engine. They've become essential in any Subaru engine build. Every pump is checked and modified to suit the pressure relieve valve. This kit will ensure greater reliability from your Subaru EJ Engine. Each relief valve is EN40B Nitride hardened and machined to the correct size. Then the relief valve gets a 14 hour super finish polish making them as smooth as possible. Each relief valve has a
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