An interesting discovery!

The 617.950 engines used in the W116s were actually rated at less power than the later 123 engines, so the 123 heads (.952) can't be worse for flow than the .950 ones if my logic is correct...

Something tells me the head castings themselves are near identical from when the 617 was first born right through to when they stopped making them in the 90s.

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1978 300D, 373,000km 617.912, 711.113 5 speed, 7.5mm superpump, HX30W turbo...many, many years in the making....
1977 280> 300D - 500,000km+ (to be sold...)
1984 240TD>300TD 121,000 miles, *gone*
1977 250 parts car
1988 Toyota Corona 2.0D *gone*
1975 FJ45>HJ45
1981 200>240D (to be sold...)
1999 Hyundai Lantra 1.6 *gone*
1980s Lansing Bagnall FOER 5.2 Forklift (the Mk2 engine hoist)
2001 Holden Rodeo 4JB1T 2WD