This is a high quality Renolds primary chain, and Renolds split link to fit a Norton SOHC engine, with standard Norton clutch basket diameter (i.e. either International or Manx).
Note: standard SOHC International/Manx primary chains are listed as 76 Links in the 1948 Norton spares catalog. Our chains are 78 links (including the split link), so you can fit the chain to be sure - in case using a larger than standard engine sprocket. Then once trial fitted you can remove the extra link(s) with a chain splitter/angle grinder, if not required.
Also: It is always stated that primary chains are less prone to breakage if fitted with a riveted 'soft link', rather than a 'split link'. This is particularly true if using the primary chain on a racing machine, using just a chain cover rather than the oil bath. However, although we cannot recommned the split link over the soft (rivetable) link, we understand that most customers prefer the split link for ease of fitting - so these come with the chain as default. We do sell the soft (rivetable) links as well though as a seperate item
Note, this chain will also fit OHV/SV models, having the same pitch. However, just as with the SOHC models, it may be necessary to remove a link or two, depending on what engine sprocket size you are using. If you do not have a chain splitter, this is easy to do by carefully removing the rivet heads of a link with an angle grinder