M119 engine was 3.8L, 4.2L, 5.0L, or 5.6L. The 3.8L version (I don't know wha the subtype number are) originally came with a single row chain. The 4.2L had a double row chain, but it's still very weak compared to the 5.0 and 5.6L models.

Might have been an SLC rather than an SEC -- would have been then a W107/R107 chassis rather than a W126.

There is a kit to covert the 3.8L to a double row chain, but it's expensive and a real pain unless you need to take the engine apart for another reason.

Else a very nice engine, and someone else has already fixed the other know "goof" at the factory -- the headbolts seize and require steel inserts be installed to repair the now threadless holes. Big PITA and costly -- later engines have the inserts installed during production.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!