Is this what the plug should look like for a 1969 351W with Automatic Trans and Without A/C?
Does anyone know the thread size I need to buy?
Thanks.
Yes for a non-AC car it would have a square top. In your picture the plug below that appears to be domed in my picture. Will have to take a look at my pictures to see if that detail matches
Sorry don't have one to measure the threads at the moment
Follow up. Here is a close up of an original. Appears there as some small differences.
Hope it helps
(https://www.concoursmustang.com/forum/gallery/21/6-090525155628-21024268.jpeg)
Thanks. That helps!