Photos a bit blurry, but it appears the liners are installed in almost exactly the same was as the 2-piece block Merlin (i.e. "sandwich" top hat) -Thanks! How are the liners attached? If I remember correctly, the carburettors are between the inlet and the supercharger outlet?
I wonder what improvements were made on the AM-42 over the AM-38? Net sources indicate the AM-42 had a very low compression ratio of 5.5:1...