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Page 5
"Silvertop" 20 Valve
S2 version with improved inlet manifold shape - The 20 Valve engines evolved during their production life with changes of a generally minor nature involving principally, a reduction in reciprocating mass ( flywheel, conrods, etc) airflow (manifold shape, valve size, throttle body) piston design and injector capacity. Most improvements were introduced at model change, but some significant changes were introduced within a model run.
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