This booklet is written to assist owners of long stroke ohc Nortons, especially those who have had to assemble engines from bits and pieces collected over a period, and from a variety of sources.

Careful component matching was undertaken at the factory. Sadly, most of us have to make do with wha we've been able to find.

From the information contained within this manual, it should be possible to build a good reliable engine and even prepare an engine for racing.