Are 340 motor mounts brackets the same as 318 brackets.Looking for a set for a 72 B-body with a 340 and some say they are the same and some say a are different.Anybody know?

The distance between mounting flanges on the driverside of a 340 are 1/2 narrower than the 318. Here is a photo of the measurement on a 340. Approx. 2 1/2" 318 is approx. 3" measured the same way.

Joe

Any pictures anyone?

Just posted one above.

These are A body style mounts one of which was converted. It will give an idea of the distance change.

360 mounts are also the same as 340 if you fine some of those.

This is a set of 340/360 mounts for B bodies



A member here had these on a Dart and is looking for a set of A body mounts. If you have a set of A's I bet he'd trade you.

B/C/E body 318 mounts will work on any 340-360, the passenger side is a direct interchange...on the drivers side you can use the 318 mount on the 340-360 engine block, just bolt it to the ears of the block,you will see a small(1/8 to 1/4 gap)between the od of the ear on the block and the id of the steel bracket at 1 bolt hole, just fill in the gap with a stack of grade 8 washers or make a small spacer and tack it to the steel bracket.the quickest way to figure it out is to bolt the drivers side 318 steel bracket to the ears of the 340-360 engine block,2 holes and bolts will line right up and go in and tighten up putting the mount in its proper place....the third hole will line up also, just the above mentioned gap will be seen,fill it in and then tighten up all 3, your done. THIS WILL NOT WORK WITH A BODIES, JUST B,C,E .

Courtesy of Greg Purcell....

lol try taking A-body 273-318 drivers side bracket and bolt it on a 340-360 block, am talking 1967-1972,here is that bracket pictured , it does not even have the piece of steel where the bolt goes....you would have to weld an ear and drill it out to get it to work, passenger side is ok, they interchange. look at the picture provided by the member who modified 1 to work.