Re: Opinion on Volvoenta B21 engines please
What do you want to know?
The B21 is actually the engine block used for several of the older AQ series engine.
I believe it was used on the 125A, 145A and (Updated from info below - 131 series is a B23)
Anyway in short these engines of course are pretty old and old technology. But they are relatively easy to work on and supposedly very solid as long as you don's abuse them.
Please be a bit more specific in what you are looking for and we will see if we can help.