Yes, I may be mistaken but I think the FB is a trimmed version of the F. Volvo had problems with lossing too much power from all the emission controls they stuck on the F engine in the early 90s and so they made the FB. I think, but could be wrong, that it has the famous 531 head and a different cam. I know it has 136 bhp. For a non-turbo engine, it is not a bad one.
George
[link:www.ttsservices.co.uk/my%20volvos.htm|
http://www.ttsservices.co.uk/imm021.jpg]
'95 940 Polar LPT estate (B230FK/AW71)
'87 740 GLE Turbo Diesel Intercooler estate (D24TIC/ZF22)
'80 240 GLT estate (B27E/BW55)