Here we have for your 1938-47 Indian Chief,  Scout and 741 a new repro oil pump cap. Later cast iron pumps came with this updated cap which purges the air from the oil for better performance. The difference is the later one has a nipple which the earlier one doesn't have. If yours doesn't have the nipple I would recommend you to change to this later version. Only $19.95.  Check your catalogs - best price anywhere. $7.95 Air Mail to USA. $8.95 Air Mail to Western Europe. $9.98 Air Mail to Australia,NZ,Japan and South America. All others inquire.  Check out my other auctions. Combine auctions for cheaper shipping. GST or HST on Canadian sales.  Thanks for looking!