Volvo 31-32-41-42-43-44-300 engine manuals

Basic specs are free
 and open to everyone

They usually include
engine images, displacement, 
dimensions and weight, 
essential bolt tightening torques, 
plus
characteristics of the engine 
e.g. its power and torque. 

Essential bolt torques are:
 main bearing cap bolts
 connecting rod cap bolts
cylinder head bolts
 
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