I have to laugh,I had bought a MP 528/276 cam for one of my other slant 6 builds !The cam gear took a major shit while cruizing one day. When I pulled it apart,would you believe not only was there nothing wrong with the Oil Pump Gear,but the Neoprene Distributor gear was intact without even a scratch !! But I've never had any type of problem with my oil pump gears (and I've built 3 /6's)!!!The 2 previous /'s I went with Melling Oil Pumps if that matters !!!