Restau de Mamie RD350 1973

Oui ils en parlent là
"The exhaust manifold contained vacuum-operated butterfly valves that were open during acceleration and normal running but closed and mostly blocked the exhaust when the throttle was shut, significantly reducing the flow of unburned hydrocarbons into the exhaust stream. All this made the Daytona Special run hotter, but the shrouded cylinder head effectively aided cooling, and quieted the engine, as well. Changes to the porting improved the midrange and made scavenging more efficient, and the Daytona got a mild bump in compression."

Mais il n'est pas visible sur leurs photos.