Volvo Penta 3868077 3857007 Cobra SX DP-S Upper unit Gearcase 4.3 1.66 1.43 1.51 Water Pumps These are used parts

These are used parts

) MERCURY 224 I/L4 1983-1984 6218037 THRU 6916778

so no confusion there

GM Part Number  14020553 which is interchangeable with 471595

9hp Johnson Evinrude

Volvo Penta 3868077 3857007 Cobra SX DP-S Upper unit Gearcase 4.3 1.66 1.43 1.51 Water Pumps These are used partsPart Number(s) Included Volvo Penta OMC Joint Venture 3868077 3850966 3856181 3857007 Cobra SX Sterndrive Upper Gearcase Unit From a 4. 3L GL 1994 Model 22 23 Teeth For the Upper Gears General Application Compatibility So 1. 66 is stamped on the plate, but basically the uppers only came in 2 flavors and the lowers came in 5 flavors, 1. 66 reflected the "overall" ratio after combining the upper & lower, hopefully this guide clears up any confusion.