Just want a carburetor for a 1957, 292 ci with a 1957 Distributor, B-manifold and G-heads (I am told-???)  Something that just works well as I use it only for summer fun here in MN. Then store it in a igloo.   I have read many articles and just get confused so figured that those driving them would be a better source.  Thanks in advance.

I have installed the Street Demon 625 carbs on hopped up Y engines and like RB says, they do perform very well while also providing excellent fuel economy.  These carbs are available as either 625 or 750 cfm versions but for most Y engines, the 625 version is expected to be adequate for most applications. Those smaller primary bores do give enhanced low-end characteristics while also improving the atomization of the fuel for economy purposes.  The Street Demon carbs are available with either aluminum or composite plastic fuel bowls.  To date I have used only the carburetors with the composite plastic fuel bows as those do keep the fuel cooler and reduces the chances for any ‘heat soak’ that may be present.

These carbs are considered being three-barrel carburetors but unlike the older Holley three barrel carbs from the Sixties and Seventies, the Street Demon incorporates what is called a ‘Goggle’ valve for the secondary throttle blades.  While those older Holley three-barrel carbs required a slot in the primary divider in the dual plane intake manifolds, the ‘Goggle’ valve does not require that slot or similar modification to allow the secondary throttle blade to open freely.

While the Street Demon carbs have a very clean look to them as a result of no exposed screws on their tops, this feature does require the carburetor to be removed from the engine for any jetting changes.  While the supplied jetting is reasonably close out of the box, jet and/or metering rod changes will require that the carburetor be disassembled by turning it upside down to access the necessary screws.  The primary jets and metering rods for the Street Demon carbs are specific to those carbs and not interchangeable with other carbs.  But once jetted to your particular requirements, the Street Demon carbs are both good performers and trouble free.

Here are some pics.
  

  

  

Lorena, Texas (South of Waco)