motor mount troubles

[gnatsum 12]

Hey guys, I am working on a 69 mach originally S code 390 long gone now am trying to install a 351w from an 84 Bronco. I have 3 sets of SBF mounts but each set turns out to be about half an inch off. Any ideas of what I am doing wrong?

[maxum96 32]

Half inch off where? Got pictures?

[gnatsum 12]

It is missing where the drivers side motor mount aligns with the frame mount. I was able to get the passenger side bolt to go in. I'll try to get photos.

[miketyler 15]

I had same issues with my 351C and new motor mounts. Not off by half a bolt hole, closer to 3/4" or more. After confirming part numbers turns out others were reporting similar experience. Ultimately, had to get a prybar and stretch the lower half of the motor mount to bring it into place. I blame it on cheap motor mounts.

[jmlay 80]

There were different frame brackets used depending on body style & engine combination, some were dual function. Here is a page from the CJ site that may be useful.:

 

http://www.428cobrajet.org/id-motor-mount-support-bracket

[LindenBruce 27]

Jimlay is correct. The lower mounts were different from small block to big block. You will need the big block lower portion if you are going back to a big block. That's prolly what the issue is. Bruce

[gnatsum 12]

Thanks everyone. I'll keep trying. I'm wondering if my shock towers are spread out a little or something .

[buening 63]

If you want you can make your own, if you enjoy that kind of thing and have the tools. See the link in my signature.