amc motor mount questions - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 09-08-2000, 12:36 AM
Posts: n/a
amc motor mount questions

i looked for this info at more off road, but couldn't find it, maybe you guys could help me out, i'm swapping out my 258 for a 360, and i am trying to figure out which motor mounts i need for the swap. do i need to switch the whole metal engine side bracket? or just the rubber mount, any info would be appreciated.

Sponsored Links
post #2 of (permalink) Old 09-08-2000, 09:06 AM
Keyboard Implanted
jeepgod's Avatar
Join Date: Jan 2000
Location: Wildomar, CA
Posts: 4,618
Thanks: 0
Thanked 3 Times in 3 Posts
Re: amc motor mount questions

the rubber mounts are the same.. you need the metal engine mounts that are on the frame.. and also the ones that bolt to the engine.. i dont know the width of your frame.. but if you have a 258 in there now.. you should be able to use the ones you have.. i think you need to drill the passenger side out... or swap it out for a v8 mount.. also.. depending on what type of mounts you have there.. i am assuming they are jeep style mounts..

<font color=orange>survival is instinct, but living takes guts</font color=orange>
jeepgod is offline  
post #3 of (permalink) Old 09-08-2000, 10:32 AM
Posts: n/a
Re: amc motor mount questions

mountain offroad sells the "bombproof" mounts. I have them in my CJ. I love them. They are bombproof.

1997 TJ w/ 33's
1984 CJ7 V8 SOA w/35's or 39's
OverMost 4wd Club President
Sponsored Links
post #4 of (permalink) Old 09-08-2000, 06:20 PM
Posts: n/a
Re: amc motor mount questions

I just completed my 258 to 360 swap in a '86 CJ7 and used the MORE Bombproof mounts. They are Bombproof but pricey. The MORE's allow you to change the oil pan gasket w/o removing the motor mount and greatly simplified the installation of my headers. I was also influenced by the lack of quick availability of stock 304 mounts. The bolt pattern on my 360 for the engine mounts was completely different from the 258, so I needed both engine mounts. When comparing the frame mounts, I thought the driver's side mount could have been drilled & re-used but the passenger side would have required replacement. I couldn't find a pass side frame mount in the required time frame, so I bought the MORE's. Ofcourse, after my purchase I found a couple of places with the stock engine & frame mounts for $70-80 less than the MORE's.

post #5 of (permalink) Old 09-08-2000, 06:56 PM
Posts: n/a
Re: amc motor mount questions

I did this a few months ago. The driver side frame mount will work. The passenger will have to be swapped or modified (slotted). The engine brackets and mounts are both different. Very easy. If I had this info before I started, it would have helped tremendously. Need anymore help let me know.

Can you fix it?
I got a welder and a grinder. Heck yeah I can fix it.[img]/wwwthreads_images/icons/cool.gif[/img]
post #6 of (permalink) Old 09-08-2000, 07:09 PM
Posts: n/a
Re: amc motor mount questions

Add me to the list of folks that have done this switch (in a CJ-7). As everyone else has indicated, the left frame mount is identical for the 258 and 304-360. The right frame mount is slightly different, and carries a different part number. You can check this at the dealer parts department. I bought and used the correct right frame mount (they were available, as of about a year ago). But, after I had the 304 frame mount in my hand, and compared it with the 258 right frame mount, I could see that there was really no reason to buy the 304 frame mount. They are so similar, that the 258 mount could be modified for the 304-360.
As for the block brackets..... the brackets that go between the 304-360 block, and the rubber mount..... I bought an extra set when I was working on my own project. I've only got 20 in them, and they are available to anyone that is interested.
If part of your question is about which rubber parts to use, I believe you should ask for the rubber mounts for the factory-installed 304, from around 1976, to around 1982 (CJ) (unless you choose to use an aftermarket mount, like suggested in these other posts).

post #7 of (permalink) Old 09-10-2000, 01:37 PM
Posts: n/a
Re: amc motor mount questions

One point to be aware of, is that the CJ mounts put the engine off set to the drivers' side about an inch and with a slight twist. SJs mount the engine centered. Carefull measurements of the Scout may reveal that SJ/J10-20 type frame and engine brackets will work better and are alot easier to find in a wrecking yard. The SJ/J10-20 engine block to mount brackets are the same as AMC V8 cars, also. (They probably came with your 360!)

Advance Adapters sells a universal AMC V8 mounting kit that uses XJ style engine mounts, they are of the weld in type. They can accomodate most frame widths as they have slots to allow side to side movement. Cost around $200.

Hope this helps, good luck!

Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Off-Road Forums & Discussion Groups forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome