help i.d. a detroit 2stroke 4 cyl engine size

[sweetk30]

i found a possible deal on a 4-53 or 4-71 detroit that ran when parked cause it was to out dated for its use anymore .

its in a genset unit and was to complicated for young people to figure out at the place it was used so they got a newer unit that was stupid proof for them to run and just parked this unit .

i have no clue what size 4 cyl it is but if i can get it i would like to know what i have to deal with . then if i can get it to run maybe what it would take to stuff it in a project truck . . . but thats much later if it happens .