The 1M-245 marine engine was based on the period six cylinder car engine. 1,865 of these engines were produced between 1947 and 1950. They could be had in left hand or right rotation configuration and with a variety of reverse gear ratios. I will be posting pictures of actual engines now at the Packard museums at a later date.
Adding a picture of the 1M-245 engine now on display at the National Packard Museum, Warren, Ohio.