Re: Can I substitue a 1949 288 for my 1951 288
Posted by HH56 On 2023/2/18 15:20:59
The transmission change is not too much of an issue because the bell housings will interchange and most other trans related stuff between the two type trans is bolt on. The problem you will have is with the combined motor and transmission mounts.
The 49 models had a plate that bolted on the front of the engine to provide a support for a single engine mount and yoke which went to the front crossmember under the engine. There are two more mounts on either side of the transmission to complete a 3 point arrangement. In 51 that was reversed with the engine having 2 mounts that bolt on either side of the block and go over to the frame with the Ultramatic having a single mount relocated to the rear bottom of the transmission.
Because of the bolt on front plate it is relatively easy to transfer all the mount hardware to install a 51 and later engine in a 40-50 model but that is not the case if going the other way trying to install the earlier engine into a 51 and later model. Not saying it cannot be done but do not know of anyone who has tried. Prior to 51 there are no holes or any cast mounting bosses on the sides of the block for mounts. You would need to come up with something and I am not sure the casting thickness of the 49 block wall would be strong or thick enough to get away with just drilling and tapping holes..
Here are photos showing the difference.
Attach file:
40-50 mount.jpg (107.64 KB)
51-4 mount.jpg (132.91 KB)
The 49 models had a plate that bolted on the front of the engine to provide a support for a single engine mount and yoke which went to the front crossmember under the engine. There are two more mounts on either side of the transmission to complete a 3 point arrangement. In 51 that was reversed with the engine having 2 mounts that bolt on either side of the block and go over to the frame with the Ultramatic having a single mount relocated to the rear bottom of the transmission.
Because of the bolt on front plate it is relatively easy to transfer all the mount hardware to install a 51 and later engine in a 40-50 model but that is not the case if going the other way trying to install the earlier engine into a 51 and later model. Not saying it cannot be done but do not know of anyone who has tried. Prior to 51 there are no holes or any cast mounting bosses on the sides of the block for mounts. You would need to come up with something and I am not sure the casting thickness of the 49 block wall would be strong or thick enough to get away with just drilling and tapping holes..
Here are photos showing the difference.
Attach file:
40-50 mount.jpg (107.64 KB)
51-4 mount.jpg (132.91 KB)
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