They made several displacements for the 466 series: DT360, DT408, DT466, DT530 and now DT570. I think DT stood for "Diesel Turbo"
It started out as a farm tractor engine in 414 cid in the 1960's.
The 9.0 has some good points: easy to start when cold, and suprisingly decent fuel economy. If your friend sells that extra 9.0 tell him they are in high demand with the tractor pulling crowd.
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Two 1975 455 Grandvilles &
'79 455 Trans Am
‘69 Camaro SS 396/375 (owned since ‘88)
‘22 Toyota Sequoia V8
‘23 Lexus LS500 awd
‘95 Ford F-super duty 4wd 7.3 p-stroke
& countless Jeeps & off road vehicles. 
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