1969 mustang engine swap

[outrick]

i have a 1969 mustang fastback that came from factory with 6cyl.I have a rebuilt 351m in a 1977 ford f150 I would like to install in the mustang untill i finish building the 302 that came with the car ( wasn't installed).has anyone done this and if so what problems did you run into! thanks

 

[bnickel]

first off, it won't work unless you plan on doing some pretty serious fabrication on motor mounts. there is not a stock or even aftermarket motor mount that will adapt a 351m/400 into an early stang. you will also have to use a different transmission, as the 351m/400 uses a 429/460 bellhousing bolt pattern. IMO, i'd just wait until the 302 is finished

 

[D.Hearne]

One more thing to add----- changing spark plugs will be damn near impossible too with a 351M in a 67-70 Stangs engine bay. Tried the fit with a 400 once in a 67 Stang, same block/heads as a 351M, Couldn't access the spark plugs at all.

 

[bsedwebt70-5.0]

I had a 1970 mustang 15 years ago that had a 351m in it - I did not put it in myself but it fit well and gave no problems - I have no idea what mounts were used

 

[outrick]

1969 engine swap

thanks to all for the info . I had a feeling it wasn't going to work without major work. I guess plan b will work sell the truck and use that money to finish the 302. again thanks