The Works Racing cam box is fully interchangeable as an assembly with the Norton original (350cc and 500cc).
However, there are some small detail component improvements that mean that not all internal parts will fit into an original box.
These changes focus on two areas:
i) Improving the accuracy of the assembly by reducing the backlash in the gear train, thus greatly reducing the variation in valve timing and giving better performance - especially at high speed.
ii) Fully enclosing the valve springs to avoid oil leaks. Unique magnesium castings are used, sealed by O-rings top and bottom. This avoids having to use silicon, thus saving considerable time when performing service work.