w108,107 Parts Hoarder
Date registered: Jun 2010
Vehicle: slc5.0cab 280sl5sp 280se4.5 500sl92 GONE:280sl79 4xW114/5 3x450sl72-3 280slc4sp81 280s69 73,81SLCs
Location: Philadelphia Area
Mentioned: 27 Post(s)
Quoted: 1573 Post(s)
I am pretty confident the 4.5 was the last iron block m117 engine (and the first m117). The only confusion I could possibly see with respect to this is the fact that the next m117 engine to be produced was the 5.0 liter in the 450slc 5.0, a car of which only about 1600 were produced. In that version of the 5.0 m117, there is/was a detachable aluminum flange/adapter plate where the transmission connects, just like the iron block engines. On the cars labeled 1980 model year and later, the 500slc (and the 500sl, and probably any 500 w126 cars) the adapter plate was integrated to the block, not a separate piece of metal like the early alloy 5.0 engines.
I don't know how or why an experienced MB mechanic would say that any v8 engine after 1980 was an iron block.
Maybe a straight 6?
Maybe some other confusion?
My dream car is a classic sporty five speed (stick+overdrive) convertible that seats five. If, you want 70's-80's Mercedes tuner wheels, let me know.