I know it's an off question..thought I'd see just how varied the knowledge on here is And I do actually need to know. It came in the mid 80's 300SD.

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"American made baby. 100% American iron. The muscle among the masses. My hero. Yep, you can take your ergonomically designed, space age, computer controlled, 4 door, cup holding map lighted split double wishbone split fold down retractable cargo covered moon roof piece of transportation and keep it. For I have felt the thunder. And I know the difference!"
JSP Motorsports
ICON Motorsports

 

i have a 4 in my shed and don't know what it is. mine is a '61 190d

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ICON Motorsports
1st & 3rd

 

83-85 models had 2998cc/183CID
86-87 models had 2497cc/152.4CID

So you can think of them as a 3 liter and 2.5 liter engine. And if you're thinking about using the turbo, yes it would work nicely on a V8 and 2 would be even better.

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Stephen's racing page

87 IROC-Z Pro ET Bracket Race Car
383 stroker (carbed) with double hump cast iron heads and pump gas
454 Big Block buildup now in progress for the 2001 racing season

Best results before the 383 blew up
Best ET on a time slip: 11.857 altitude corrected to 11.163
Best MPH on a time slip: 117.87 altitude corrected to 126.10
Altitude corrected rear wheel HP based on power to weight ratio: 476.5
Best 60 foot: 1.662

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley

 

Well..I already have the turbo off one, and will be using it as one half of a twin setup

Wish I knew the A/R of the turbo tho..

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"American made baby. 100% American iron. The muscle among the masses. My hero. Yep, you can take your ergonomically designed, space age, computer controlled, 4 door, cup holding map lighted split double wishbone split fold down retractable cargo covered moon roof piece of transportation and keep it. For I have felt the thunder. And I know the difference!"
JSP Motorsports
ICON Motorsports

 

With extremely few exceptions, the engine displacement is in the cars name. The letter designates the class (E, S, C, etc...)Ex: 240D = 2.4 liter engine, E320 = 3.2 liter engine, S500 = 5 liter engine and so on. BMW uses a similar system, except they use a number system for their classes. Ex: 328i = 3 series, 3.8 liter engine, injected. 540il = 5 series, 4 liter, injected, long wheelbase.

 

If I remember correctly, it's been many years since I worked on them, they are Garrett turbos. Can't you contact them somehow and ask?