where is the date of manufacture of the engine 454

hello i have a big block engine 454, which is the date of manufacture of the block, please help

If you run the number located on the stamped boss in front of the passenger side head on the block, it should give you the info you need.

side of block and back by the upper bell housing peak small pad will be a letter that month then date and last two numbers are year like 73 would be 1973 front deck pad just tells were it was made and what it was in and trans and car

I found only those numbers

Hello, That checks out to be 75-87 light duty truck

F099 is June (the F) 09 (9th day) 9 (1999)