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By 58rancho - 14 Years Ago
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I have a 58 292 w/holley 2v. I bought an ECZ-9425-A intake this weekend. Is it worth it to swap to the 4v or just put the big Holley 2v on my existing intake. The car is used for pleasure driving only. Thanks!
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By The Master Cylinder - 14 Years Ago
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58Rancho. The "A" manifold is pre-1956 and takes the small base 4 barrel (Holley Teapot or Carter WCFB). You will need an adapter to use any of the more "modern" 4 barrels.
You probably will be happier with the set up you have. Just my 1¢.
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By 58rancho - 14 Years Ago
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Thanks for the info. I thought the carb inlets looked small, but it was only a $10 investment!
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By PF Arcand - 14 Years Ago
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MC; Shouldn't that be pre 1957?..
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By Ted - 14 Years Ago
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From a performance perspective, the two barrel intake with a 500 cfm Holley will outperform the ECZ-A manifold being used with an adapter and later model larger carb. From an efficiency perspective, the ECZ-A manifold with its smaller runners will be exhibit more torque in the lower rpm band while also having the potential for higher mpg under the same driving conditions.
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By yalincoln - 14 Years Ago
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say Ted, have you checked a late 2bbl manifold with 4bbl adaptor against a early small 4bbl manifold with a late adaptor, using the same 4bbl carb?
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By The Master Cylinder - 14 Years Ago
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PF Arcand (6/20/2011)
MC; Shouldn't that be pre 1957?..
Paul, Of course you are correct. What I meant to say was 1956 and before, but I changed it to read pre-1956. This was all before I had a brainphart and forgot what I was doing. In other words a typical senior moment. 
Thanks for correcting me.
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By Ted - 14 Years Ago
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yalincoln (6/21/2011)
say Ted, have you checked a late 2bbl manifold with 4bbl adaptor against a early small 4bbl manifold with a late adaptor, using the same 4bbl carb?Nope. Might consider doing that for a future single four intake dyno test but that’s going to be a ways down the road.
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By 58rancho - 14 Years Ago
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Thanks for the responses! Would there be any advantage when using the Carter WCFB over what I have now? I prefer the original look, but not if there will be no gain! JQ
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By The Master Cylinder - 14 Years Ago
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The a manifold is restrictive so I don't doubt it going to help. Reread Ted's post. I'll stick with my original statement, What you got is better...
Ted's statement:
"From a performance perspective, the two barrel intake with a 500 cfm Holley will outperform the ECZ-A manifold being used with an adapter and later model larger carb. From an efficiency perspective, the ECZ-A manifold with its smaller runners will be exhibit more torque in the lower rpm band while also having the potential for higher mpg under the same driving conditions."
Ted
Lorena, Texas (South of Waco)
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By slumlord444 - 14 Years Ago
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The best bet in my opinion is the factory 4 barrel carb and intake off of a '57 312. Had a Carter AFB off a 312 Merc on my '58 292 back in '63-'65. Ran great and very streatable. Your '58 292 should have the ECZ-G heads with the big valves. Makes a good combo.
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By Pete 55Tbird - 14 Years Ago
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You asked about the "big" Holley 2BBL carb vs the "small" Holley teapot carb. What is missing here is that the BIG holley 2BBL flows 353 CFM at the same manifold vacuum that the SMALL teapot flows 400 CFM. How can this be, you ask? Well because one is rated at 1.5 inches of vacuum and the other at 3.0 inches of vacuum. Hint the 4BBL at 1.5. So be careful what people tell you and don`t believe everything you read. Pete
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By GREENBIRD56 - 14 Years Ago
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I think Pete's on the right track - fit the "A" manifold on there with an adapter (you can get one from Speedway or several other vendors) and start hunting for a good (later design) four barrel carb. When the opportunity arises - switch to the later "B" manifold. I like Holley's (390 or 400 cfm 4160) and the Road Demon Jr. (525 cfm) ....but the Edelbrock (500 cfm) has shown itself to work well too. As Ted spoke of earlier - the four barrels can give you some nice low end torque and mileage that the big two barrels can't - and some top end power too. If you haven't already done so - look at changing to a late distributor arrangement and "quick" advance curve.
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