You may be thinking of a M11 Cummins
One
44 quarts is the norm for the M11.
44 Quarts
Follow the link posted in 'Related Links' at the bottom of this page.
Any 15W40 diesel-rated oil is fine.
Rocker assembly 135ftlbs rocker box or housing is 35ftlbs
160 hp- 180 hp
210 hp
350 hp350 hp
Anywhere from 85 horsepower up to over 1000.... Cummins makes a wide range of engines for various applications. It would help to know what model of Cummins engine you had (e.g., 6BT, 8.3, L10, M11, N14, Signature, etc.
165 hp and 400 lb-ft of Tq