Have 60 Bird with 430. on the back of the motor is a metal bracket holding a metal line coming up to it from the tranny. The line has a metal cap on it-looks almost like a tire valve. What is this and what is it for?

It is a test port for the trans. Someone somewheres had posted a photo and description from the Shop Manual, so full description should be there.

Thanks for info

There is a whole lot more information on this thread;

http://www.squarebirds.org/dcforum/DCForumID1/1047.html#6

(Because of the limitataions on this forum, you need to Copy & Paste the URL into your browser)