A Gotaverken engine. I have fourteen of these built by George Clark /NEM between 1961 and 1964
All were 760mm bore and either 5 or 6 cylinders producing 6300 or 7500 BHP
5 for Pickersgills : Surrey Trader; Bridgepool; Welsh Herald; Middlesex Trader; Victore
3 for Bartrams : Montrose; Austriland; Avisfaith
3 for Laings : Atomena; Mogen; Barbara
2 for Thompsons : Nego Anne; Kollfinn
1 for Shorts : Carlton
1 for Smiths Dock : Senorita