1934 16/6 18/6 engines

[Humphrey47]

Are there any obvious differences between these two engines? Are they both monobloc? Do the numbers indicate the HP?

[stevef]

Hi.I have read somewhere that from 1934 monobloc engines came in to use. Not sure about the engine numbers but mine ends in 16 and is a 16 hp as to the difference between the 16 and 18 monobloc engines the only thing I can go on is the parts list according to that the only difference I can see is cylinder head/ head gasket and pistons. Someone correct me if im wrong. Yours Steve