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Old 04-26-2007, 12:05 AM
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Carb adapter: 4 hole or open style?

I'm trying to decide which carb adapter would be best suited for my application. It's a chevy 350 in a 4x4 truck. I'm thinking about swapping the quadrajet for a edelbrock 1406 which is a square bore carb. So in order to put the squarebore on the stock manifold I need an adapter. Is there any performance difference between an open type spacer adapter vs a 4 hole adapter. For example, this:


This engine is built for low rpm torque. It is not a high rpm, high horsepower build. I'm looking for something that will be most efficient for daily driving and low end power for towing and full loads. Will there be a difference between these two adapters?

Also, since I have your attention. Is the edelbrock 1406 a good choice over say a holley 1460? I'm a big fan of holley 4150 double pumpers for performance applications, but this is a daily driver and economy is a major concern. I've never used an edelbrock carb but they seem to have a lot of fans for street applications so I thought I'd give one a try.
Any help is appreciated,
81 Grand Prix, 355, 700r4, 8.5" 4.10
64 Oldsmobile Jetstar, all original
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