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Old 01-14-2005, 04:38 PM's Avatar is offline Moderator
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Twin cams are used in overhead camshaft engines with hemispherical combustion chambers. Since the valves are angled into the chamber from opposite sides and the benefit of an overhead cam is best realized when there are no rocker arms, the only way to make it work is to have a separate camshaft for the intake and exhaust valves.

Twin carburetors means just that - two carburetors on an engine. The idea is to provide more flow area in the fuel/air mixing system so the engine can rev to higher speeds (more power) without being choked off due to too small a carburetion system.
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