First time posting and looking for some help as i have purchased a project that is over my head and starting to feel it. THis one could be ugly. Car is a 67 GT born with a 390 that was swapped to a 289 at some point in its life. when i bought the car it came with a 390gt block and c6 out of a 67 mustang gt. I have the motor and transmission ready to go in and when i tried to fit the original 390 motor mounts on the inner shock tower they won’t line up, in that the brackets won’t go deep enough to line up with any holes. The 289 brackets had two bolts and the 390 brackets have one. The original holes in the shock tower that the 289 mounts went in are smaller in diameter than the 390 bolts too. Did they make different shock tower mounts for the 390 and 289. i hope i am doing something wrong but the thought of having to change out the towers is keeping me awake. any feedback would be appreciated!!!
Welcome!
Here’s a source point for pics & info.
https://secure.cougarpartscatalog.com/store/Search.aspx?SearchTerms=motor%20mounts&CatID=15855
This information may help you: 69 Engine mount issues - #3 by CougarCJ - I’m pretty sure there was a link to a YouTube video on here somewhere that went into great detail on the issues between FEs, 335’s and Windsor series motors.
This is the video I was looking for, hope it helps: https://youtu.be/j_GqRCS3EZE
You are confused. In 1967 289 and 390 used the same frame mounts. Both have two bolts attaching them to the frame. The rubber isolators for the 390 are the same through 1973 and they are available. You need block plates as well, also available. There is no difference in a 390GT or another 390 block.
Frequently; thanks for the education.
The insulators for the 1967 289 are not available and have not been since around 1970 - if you have some that are usable they are worth saving.