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Old 11-02-2019, 07:41 PM   #21
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Default Re: Dual carb advantage?

FRNKEORE send me an email at jhljr44@yahoo.com Please.
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Old 11-02-2019, 09:53 PM   #22
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Default Re: Dual carb advantage?

You should be aware that the 4 BBL manifolds from Offenhauser and Edelbrock (as well as the one Speedway sells under it's own label) have what is known as the "square bore" carburetor bolt pattern. As such, they all need an adapter to use a Holley or Edelbrock. There are many carburetion experts who view any kind of carb adapter as inefficient.

I like the look of older "square bore" 4 BBL's (WCFB's and early Rochester 4G's) on these engines over the new Holley's and Edelbrocks. However, decent cores are almost impossible to find and expensive if you do.

This was not the case 10 years ago.

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Old 11-03-2019, 08:33 AM   #23
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Default Re: Dual carb advantage?

Benefits...Looks Cool... Chap
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Old 11-03-2019, 10:09 AM   #24
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Default Re: Dual carb advantage?

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Originally Posted by philipswanson View Post
What's the title and/or ISBN of the book. I'll pick up a copy.
Flathead Facts by John W Lawson.
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Old 11-03-2019, 10:02 PM   #25
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Default Re: Dual carb advantage?

Thank you all. FRNKEORE was great talking on the phone and great tips. I will put it up n the rack and run it and check to see where the vibes come from. Also will check on the bigger carb with a 4 bolt conversion. You guys are wonderful. Jim.
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Old 11-04-2019, 01:35 AM   #26
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Default Re: Dual carb advantage?

It was very enjoyable, talking to you, Jim.
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Old 11-04-2019, 07:39 PM   #27
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You can get Johns book at Max VP, He also had many parts for the engines and transmissions.
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Old 11-05-2019, 07:20 PM   #28
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Default Re: Dual carb advantage?

I'd go for more wan... show factor, I drive with twin 97's on a slingshot everyday. with mine it takes a while for it to heat up and run well, meaning I have to keep the choke on longer. In traffic the single carb is probably faster too. But whats surprising is that I can get 22Hg with the twins [at sea level, idle just over 600 rpm] not bad for a flathead...
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Old 11-05-2019, 08:11 PM   #29
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Default Re: Dual carb advantage?

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But whats surprising is that I can get 22Hg with the twins [at sea level, idle just over 600 rpm] not bad for a flathead...
Yeah, but that is because you guys are upside down and your sea level is a lot lower than ours . . . causing much better vacuum to be generated.

Just kidding yah!

I hope to get back to OZ soon - I only wish I could bring one of my HotRods over to drive from the Gold Coast back to Sydney. I've had some wonderful times on that route!
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Old 11-05-2019, 08:59 PM   #30
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Ohhh its global warming..
You'll have to try the west coast next time!
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Old 11-05-2019, 10:01 PM   #31
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Default Re: Dual carb advantage?

If you are not going for max acceleration and just want to drive. You could probably get around 22mpg on a single carb. 4 barrel being the in-between. It was in the 70s and big blocks gas wasn't a concern. Well...


Most of us don't drive these everyday. I'd have a gasser to get groceries once a month in a perfect world.



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Old 11-09-2019, 06:23 PM   #32
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Default Re: Dual carb advantage?

Had a 53 Mercury manifold complete with carb, fan 4 blade and fuel pump. Is this T-pot carb any good and would it perform like a Rochester 2g? What is the CFM?
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Old 11-09-2019, 06:24 PM   #33
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Given to me . FREE.
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Old 11-09-2019, 06:30 PM   #34
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Default Re: Dual carb advantage?

They're all right, I guess. They are a bit smaller than the small base Rochesters, and parts and kits are harder to find and pricier. On the other hand, you don't have to bore the manifold out for them to perform at top efficiency. They are Holley 885's. I would check with some of the carb guys (Charlie ny, scicala, Uncle Max) and see if they will rebuild them and how much.

The price is certainly right.

Last edited by tubman; 11-09-2019 at 06:36 PM.
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Old 11-09-2019, 06:54 PM   #35
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Default Re: Dual carb advantage?

which 2bbl would give me the best performance with the Merc manifold?
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Old 11-09-2019, 07:03 PM   #36
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Default Re: Dual carb advantage?

I have never run a Merc carb (885), but I would expect that the Rochester (being a larger, more modern carb) would yield better performance. You might also want to consider a Holley 2110 3 bolt version, as they are larger than a stock 94. The 2G flows more than the 2110. Both of these choices would require enlarging the manifold throttle bores. When I do a Mercury manifold for a 2G, I use a "Rota-Broach" that will bore them out all the way down to the floor of the manifold. I then use a die grinder to blend the edges. It's probably overkill, but it's kinda fun!
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