Most standard 670's have the regular cummins. Same for the 780's. Unless they are D-16's then they have the same motor as the 880's. Check out the Volvo website and you will find the specs. Of course if it is a company truck it is probably turned down. You will need to plug it in to see what it is set at.
my truck is volvo FH12. Engine type is D12A engine.. Anyone cn help have this engine specification?? thanks..
go here.........http://pdfcast.org/pdf/volvo-operator-8217-s-manual-maintenance-and-engine-vhd and download. if its not what you require, get back to us.