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The water jackets on the first series of m180 engines had a plate on each side held on with LOTS of allen bolts ,These plates rust out are impossible to find new . This was necessary because Daimler was still getting back up from WW2 and couldn't yet afford to cast a block with the water jackets as a whole.
The damper is the vibration damper on the crank shaft . The early engines have a spring loaded device,invented by Lanchester in England .
The later engines have a rubber cored damper,pretty much the same as most engines.
The first pic with the twin carbs is a early 1959 W111 finny engine . Note it only has the freeze plates on the block,no sideplates and the small damper .
Second picture is of the first M180 built,in 1946 . Single carbed ,side plates on the block etc.
Alloy heads are lighter and give better heat transfer . Mercedes Engines ,except the sidevalve six cylinder 230's of the 1930's are all Alloy heads.
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