Date code is a number(day of month)then a letter(A to L month of year) followed by a number(year in decade)If its a blue engine that number would be 0,1,2,3 or 4 or 5,6,7 a black motor. 8 or 9 later VN. I have a VS block and cannot find 304 or 4.9 stamped anywhere on the block which means its...