Hi everyone, it's krazykuda here to show you how the engine mount brackets bolt to the engine block...
In this chapter, I will show you how the brackets go on the engine block... I will be using the 67 - 72 style brackets in this example, but the brackets go to the ears on the engine block the same way for all years...
Ok, let's start out with identifying the mounts...
The mounts for the right side of all small blocks are the same for 273, 318, 340, and 360...
However, the left hand mount is different depending on what small block you are installing... There is one mount for 273 and 318, and another for the 340 and 360... The left side 273 and 318 mount is the same spread/width as the right side if you put the ears together to compare... The left hand side on the 340 and 360 are slightly narrower than the right side as shown in the picture below... The mounting ears on the block are closer together on the 340 & 360 than the 273 and 318, so make sure you have the right mounts to fit your application... (I learned the hard way, that's how I know...)
Here is a closer picture of the right and left brackets side-by-side to show the difference...
Here is the left side mount for the 64 - 72 style engine mounts... It looks identical for both 273 and 318, compared to the 340 and 360, but the spacing between the ears is different...
You can see that it has 3 holes for the 340/360 mount...
The right side mount has 4 holes and is common for all small blocks 273, 318, 340, 360...
Now before you mount the brackets to the engine, make sure that the rubber mount is tightened to the metal engine bracket... I cannot find the torque called out in the service manual specifically for this one, but for the same size bolt that goes to the frame, the service manual calls out 85 foot pounds...
OK, now it's time to bolt the bracket to the engine...
Left/driver side mount:
Note the direction of the bolts that hold the mount to the engine...
Install the bolts so the head of the bolt is on the front of the mount ears for all the bolts and the shaft of the bolts face rearward... Then you can slide the motor mount on from the rear and install the nuts all in one swoop... It's the way the factory installed them and works better than having some bolts facing forward, and some backward...
Now with the shafts of the bolt facing rearward, the bracket will easily go over the bolts from the rear...
Install one nut first to hold the bracket in place while you install the rest of the nuts on the other bolts... In this example, I am using standard 3/8" x 16 coarse thread bolts, the factory used 3/8" x 24 fine thread bolts if you want to do a correct restoration... 3/8" x 16 coarse thread bolts will work fine if you are not concerned about building an exact restoration...
Now the rest of the nuts are installed and the bracket is in place... Now torque the bolts and nuts to 30 foot pounds for a 3/8" x 16 bolt or 45 foot pounds for the 3/8" 24 bolt per the service manual...
Always check the torques with the factory service manual and torque to the recommended spec... The torque specs for all engine bolts are listed in the back of Chapter 9 for Engines in the service manuals... Here is the torque specs from the 68 Plymouth service manual...
Since I'm using 3/8" x 16 bolts, I will go with the usual torque for the 3/8" x 16 bolts in the service manual, but if you use the correct factory 3/8" x 24 bolts to with the 45 foot pound spec... If the torque for the bolt that you are using is not listed in the torque specs, or you are using a substitute bolt than was used from the factory, find one with the same thread and pitch and use that spec...
Right/passenger side:
Install the bolts on the right side (passenger side) of the block with the bolt heads facing the front of the engine and the shaft facing the rear...
Now slide the bracket on from the back like this...
Install the nuts and torque to spec...
In this chapter, I will show you how the brackets go on the engine block... I will be using the 67 - 72 style brackets in this example, but the brackets go to the ears on the engine block the same way for all years...
Ok, let's start out with identifying the mounts...
The mounts for the right side of all small blocks are the same for 273, 318, 340, and 360...
However, the left hand mount is different depending on what small block you are installing... There is one mount for 273 and 318, and another for the 340 and 360... The left side 273 and 318 mount is the same spread/width as the right side if you put the ears together to compare... The left hand side on the 340 and 360 are slightly narrower than the right side as shown in the picture below... The mounting ears on the block are closer together on the 340 & 360 than the 273 and 318, so make sure you have the right mounts to fit your application... (I learned the hard way, that's how I know...)
Here is a closer picture of the right and left brackets side-by-side to show the difference...
Here is the left side mount for the 64 - 72 style engine mounts... It looks identical for both 273 and 318, compared to the 340 and 360, but the spacing between the ears is different...
You can see that it has 3 holes for the 340/360 mount...
The right side mount has 4 holes and is common for all small blocks 273, 318, 340, 360...
Now before you mount the brackets to the engine, make sure that the rubber mount is tightened to the metal engine bracket... I cannot find the torque called out in the service manual specifically for this one, but for the same size bolt that goes to the frame, the service manual calls out 85 foot pounds...
OK, now it's time to bolt the bracket to the engine...
Left/driver side mount:
Note the direction of the bolts that hold the mount to the engine...
Install the bolts so the head of the bolt is on the front of the mount ears for all the bolts and the shaft of the bolts face rearward... Then you can slide the motor mount on from the rear and install the nuts all in one swoop... It's the way the factory installed them and works better than having some bolts facing forward, and some backward...
Now with the shafts of the bolt facing rearward, the bracket will easily go over the bolts from the rear...
Install one nut first to hold the bracket in place while you install the rest of the nuts on the other bolts... In this example, I am using standard 3/8" x 16 coarse thread bolts, the factory used 3/8" x 24 fine thread bolts if you want to do a correct restoration... 3/8" x 16 coarse thread bolts will work fine if you are not concerned about building an exact restoration...
Now the rest of the nuts are installed and the bracket is in place... Now torque the bolts and nuts to 30 foot pounds for a 3/8" x 16 bolt or 45 foot pounds for the 3/8" 24 bolt per the service manual...
Always check the torques with the factory service manual and torque to the recommended spec... The torque specs for all engine bolts are listed in the back of Chapter 9 for Engines in the service manuals... Here is the torque specs from the 68 Plymouth service manual...
Since I'm using 3/8" x 16 bolts, I will go with the usual torque for the 3/8" x 16 bolts in the service manual, but if you use the correct factory 3/8" x 24 bolts to with the 45 foot pound spec... If the torque for the bolt that you are using is not listed in the torque specs, or you are using a substitute bolt than was used from the factory, find one with the same thread and pitch and use that spec...
Right/passenger side:
Install the bolts on the right side (passenger side) of the block with the bolt heads facing the front of the engine and the shaft facing the rear...
Now slide the bracket on from the back like this...
Install the nuts and torque to spec...
