Quote:
Originally Posted by Isaac Zackary
Many late model carbureted cars did get grids under their carburetors for emissions purposes.
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Yes, the key here is "for emission purposes". These grids are not flow restrictors or turbulence geherators. They are electric heaters that temporarily warm up the intake before water jacket warms up the intake manifold.
Venturi is the narrowest opening in the carburettor and the place where fuel is injected. Maximum speed of air flow through the Venturi facilitates fuel pulverization. Creating flow restriction elsewhere will reduce air speed at the Venturi and thus worsen the pulverization.