Sounds like you have a pre '56 barrel and head. The engine number is '57 but this has enclosed pushrods not external tubes and an alloy not iron head, so you have the correct crankcases. Not sure however, how if at all, the crankcases or internals varied between the dates as I have only owned '56 an...

Thanks Pete that's reassuring. I seem to have te correct main shaft as I have the enclosed chain case and everything fits!

I have a 1956 NH with a 57 GB44 gearbox which I believe is the gearbox fitted to the FH, does anyone know if the gear ratios are different FH to NH and if so any ideas how they differ?

Brilliant! Thanks Pete just what I wanted.

Before I remove the rumbling front wheel bearings from my 1956 NH (full width hub) does anyone know the equivalent SKF or similar sealed bearing reference for a replacement? I have a number of bearings acquired in recent years and even the actual dimensions would enable me to identify/obtain the bea...

Thanks for your prompt reply John. Just can't understand why I didn't have this problem with my other NH, just lucky I guess.

I have recently acquired a 1956 NH and on going through the routine of a thorough service and check to get everything as it should be I topped up the primary chain oil to the level hole. Now when running the engine oil streams from the drive exit of the chain case and also runs into the enclosed dri...