[Alan Roehrich]

Not sure there was even a 502 big block available from GM to convert in 1991, maybe a variant of a Mercruiser. Probably couldn't be any worse than a 6.5, but still, not good.

Not sure any conversion such as that would be called an 8V anything, since it could then be confused with a real Detroit Diesel V8.

All of the Detroit Diesel 8V engines had a crank driven supercharger, the number after the "-" is the number of cubic inches per cylinder. The suffix is a designation for options, "T" is for turbocharged, "A" is for "aftercooled".

So if it were an 8V-71T (fairly rare, they did not usually turbocharge those) it would be a 568 cubic inch V8 with a turbocharger. And 568 cubic inches is far bigger than 8.2L. It would certainly be rated well into the 300HP zone.

The 8V-92 engines were commonly used in large buses, such as the Prevost series that are made into high end tour buses and motor homes. Many of those were either an 8V-92TA or 8V-92TTA. Those engines were rated at 450HP or so.