Rocker Cover Vent Gasket

https://www.dennis-carpenter.com/tractors/engine/gaskets/eaf-6863-c-rocker-cover-vent-gasket

I ordered this and I was wondering where the square hole goes, top? bottom? My 640 doesn't have that gasket.

Follow Ups:

• Re: Rocker Cover Vent Gasket - Tool Pro 13:20:38 02/07/23 (0)
• Re: Rocker Cover Vent Gasket - Tool Pro 05:00:24 02/06/23 (5)
  • Re: Rocker Cover Vent Gasket - Ed Gooding (VA) 05:59:36 02/06/23 (4)
    • Re: Rocker Cover Vent Gasket - Terry in Mo (T-Mo) 04:21:31 02/07/23 (3)
      • From a 1959 dealer parts book - Ed Gooding (VA) 05:34:16 02/07/23 (1)
        • Re: From a 1959 dealer parts book - Terry in Mo (T-Mo) 04:25:24 02/08/23 (0)

Name   : 
E-Mail : 
Subject: 

Message:

To add a single image to your post,  click here.
To add multiple images to your post, click here.

Optional Link URL : ←http://www.yourwebsite.com
Link Title        : ←Website Title
Optional Image URL: ←http://www.myimages.com/mypic.jpg

Enter image characters into the text box.

Press Preview Message button below to proofread message & check if images and/or links are shown before posting message. Press browser's back button if correction is needed. Press Post Message button on Preview Message page to finalized your post. Thanks!