O.S. Engines 21RZ-R (P) - Manual (Page 19)

GUARANTEE
This engine is constructed from the very best
materials available and to the very highest
engineering standards, using the most advanced
precision machinery. However, the extremely high
stresses imposed by car racing operation under very
severe conditions, stresses which are exacerbated by
the use of powerful fuels containing very high
concentrations of nitromethane, constitute hazards
which are beyond a manufacturer's control.
Accordingly, we regret that it is not possible to extend
our usual warranty terms to this particular engine -i.e.
no guarantee is offered against material wear, or
damage resulting therefrom, in actual use.
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