I’m applying for a home loan and need a copy of my previous tax returns, do I really need to print all 163 pages?

You only need to print the pages required.  The file is a PDF so with any PDF compatible viewer you can select the pages you want to print.  Print the Form 1040 and all supporting forms and schedules that have an Attachment Sequence Number located in the upper right corner of the form or schedule.  The other pages are for your use only and are not part of a filed tax return.