Melling M-63HV High volume oil pump assembly. For engines with extended capacity (deep sump) pans, we recommend the Melling high volume pump. Completely brand new, assembled and ready to install. Currently, the only manufacturer of aftermarket oil pumps for the big block Chrysler is Melling Engine Parts. Melling has been in business since 1947, for over 6 decades. They currently manufacture over 3 million oil pumps every year. Aside from the billet and aluminum racing pumps made by Milodon, Keith Black and others, Melling is THE only source for stock replacement type cast iron pumps. Don't forget gaskets and attaching bolts as well (listed separately.)