In this side by side comparison, you can really see the difference in the stock 1999 TC88 oil pump vs the Screamin Eagle pump that came with the updated cam support plate. The gerotor gears are so much bigger, HD didn't have room to machine a groove for an o-ring. Harley claims...."This kit increases the oil supply by 23% and scavenging by 50% when compared to the 99-05 Original Equipment oil pump"
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