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Daves55Sedan · 09-16-2020, 05:22 PM

My understanding of the reason for wanting a 4-bbl over a 2-bbl is that during normal driving, you really only have the front two venturi's operating (like a 2-bbl), but if you stomp on it, the 2nd two venturi's kick-in and allegedly increase acceleration far better than a 2-bbl (but they suck a lot of gas during 4-bbl operation). So the only difference in performance is during hard usage. If you want to go to the races, a 4-bbl is the way to go, or even more extreme, put a blower on it.
I don't like Smithys straight design muffler tone. I have Thrush cherry bombs under my '55 and they make the Y-block sound better than anything else. Just my opinion, but Smithys has a milder tone.

09-16-2020, 05:22 PM	#5
Daves55Sedan Senior Member Join Date: May 2010 Location: Granite City, Illinois Posts: 3,008	Re: Stock 57 Fairlane 500 My understanding of the reason for wanting a 4-bbl over a 2-bbl is that during normal driving, you really only have the front two venturi's operating (like a 2-bbl), but if you stomp on it, the 2nd two venturi's kick-in and allegedly increase acceleration far better than a 2-bbl (but they suck a lot of gas during 4-bbl operation). So the only difference in performance is during hard usage. If you want to go to the races, a 4-bbl is the way to go, or even more extreme, put a blower on it. I don't like Smithys straight design muffler tone. I have Thrush cherry bombs under my '55 and they make the Y-block sound better than anything else. Just my opinion, but Smithys has a milder tone.