Just to muddy the waters, when I was young (and dirt was new) long stroke engines were popular in farm/construction equipment and didn't turn higher rpm's like the later engines in vehicles.
Tractor engines were rated at their max torque at usually less than 1500 rpm's
My 2 cyl JD engines are rated at 1050 max rpm's and the inline 4 cyl. Farmalls were maybe 1200.
in later years, the thinking was shorter stroke and higher rpm's.
