Hello old bean
i have a 1(BR) Corps Intelligence Training Directive titled "THREAT" recognition guide from 1988 for a SEA its yours, only 66 pages but covers tanks, APC, recce, artillery, air defence, engineers, aircraft on so on :-D
this is from the web
BMP-1 general characteristics
Powerplant: 1 x type UTD-20 6-cylinder inline water-cooled diesel with an output of 300 hp @ 2,000 rpm