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07-12-2006, 02:47 PM | #1 |
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Goin' back to old school carb?
This may be a no brainer but I was wonderin' if I replaced my Edelbrock intake and 4 barrel Holley 4175 Q-Jet replacement 650cfm carb with the original intake and original Rochester 2 barrel carb on my '67 283 would my gas mileage improve greatly? I have been told the Holley gets pretty good mileage for a 4bbl, but I haven't checked it.
My rebuild of the 283 was not to be a daily driver driver but now it may have to be. So I was thinking of putting the Rochester/OEM manifold back on. Thanks, JD |
07-12-2006, 03:03 PM | #2 |
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Re: Goin' back to old school carb?
i doubt you'd see an increase might see a decrease due to poorer manifold design
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07-12-2006, 05:08 PM | #3 |
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Re: Goin' back to old school carb?
2 barrel gets worse mileage. I am also building a 283 and the best advise I got was a 600 cfrm Edelbrock or Holley. Better mileage when tuned right.
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07-12-2006, 05:36 PM | #4 |
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Re: Goin' back to old school carb?
i had a brand new holley 600 worked for 3 weeks that was it
i bought a nice edelbrock intake with the duel flange design,,fit's both spreadbore and squrebore carbs.. bought a rebuilt rochester 4 barrel from auto zone for 130.00 after a few cold mornings. have the choke adjusted now..my truck has never ran better... go with the 4 barrel it will get better MPG than the 2 barrel..then if you need the extra power you have it.. get that edelbrock intake...you will never have to change intake's again.. with a adaptor you could even put a 2 barrel on that intake painted my intake orange..see picture mark Last edited by rage'nrat638; 07-12-2007 at 07:02 AM. |
07-12-2006, 05:49 PM | #5 |
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Re: Goin' back to old school carb?
maby i will go dual quads..get great milage...just kidding
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07-12-2006, 06:13 PM | #6 |
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Re: Goin' back to old school carb?
Yeah, keep the edelbrock manifold, but run a different carb than that holley. The rochesters or a small cfm edelbrock would be my choice, like around a 500CFM for that 283.
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07-12-2006, 06:15 PM | #7 |
its all about the +6 inches
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Re: Goin' back to old school carb?
the old quadra jet will be the best for MPG...assuming you get a good rebuild. I've seen one sold over the counter, it was supposed to be a reman unit, and it was pretty and had new parts tossed on it, but it was junk and it leaked more fuel than it fed the engine...and it fed a LOT into the engien. Took it back, the guy ended up getting into a pretty big argument with the parts jockey, (accused us of trying to return our core as a defective part) finally got the new one and it ran like a top and got pretty good MPG.
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07-12-2006, 07:14 PM | #8 |
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Re: Goin' back to old school carb?
If you want even better gas milage with a Quadrajet, get the book "Rochester Carburetors" by Doug Roe & Bill Fisher, published by H.P. Books and follow their advise in "Economy - Driveability & General Performance". I've rejetted several q-jets and have always experienced at least a 10% increase in fuel milage. I highly recommend this book. You can find it on Amazon at http://www.amazon.com/gp/product/091...lance&n=283155
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07-12-2006, 10:49 PM | #9 | |
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Re: Goin' back to old school carb?
Quote:
BTW Mark, which intake is that?
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07-12-2006, 11:13 PM | #10 | |
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Re: Goin' back to old school carb?
Quote:
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07-13-2006, 12:47 AM | #11 |
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Re: Goin' back to old school carb?
very nice intake,
holley=large primaries and 2nd daries.. stock quad.=small primaries, and large 2nd's.... leather the throttle, ge goo gas.. punch it, you hit the 2nd and SLURP!!! lol. only reason im keeping the stocker!!! |
07-13-2006, 03:06 AM | #12 |
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Re: Goin' back to old school carb?
I am running the new EPS 2701 intake and the stock Q-jet for a total of 12 mpg. I also don't spare any horses along the way....typically hauling over 500 pounds daily back and forth between Terrell and Dallas [30 miles].
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07-13-2006, 10:35 AM | #13 |
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Re: Goin' back to old school carb?
Thanks Mark.
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07-13-2006, 11:07 AM | #14 |
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Re: Goin' back to old school carb?
Thats interesting. Its not the first time I have heard that a small 4bb gets better mileage than the 2bb. Has anyone done this swap that could tell me the improvement? During this day and age, every bit helps.
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07-13-2006, 11:48 AM | #15 |
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Re: Goin' back to old school carb?
The Edelbrock Performer is a good manifold for a driver. Add to that a tuned Rochester Q-jet, HEI with the right advance curve and the right gearing in the rear.You should be in the 15-20 mpg range if you keep your foot out of the carb.
As for the Holley Q-jet, it should be a good choice for milage, but I have no experience with one. The big advantage of the q-jet is the small primaries. For an example, dad bought a 63 Chevy wagon. 327 with q-jet and a powerglide tranny. The last time we had the car out on the road we were towing a 68 Dodge Polara with a towbar at 80 mph. Well over 100,000 miles on the wagon and we got over 20 mpg.
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07-13-2006, 05:59 PM | #16 | |
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Re: Goin' back to old school carb?
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07-13-2006, 07:54 PM | #17 |
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Re: Goin' back to old school carb?
My grandfather was the Shop Foreman at Chevy garage in my hometown growing up. He knows how to tune a carb. He has a 1972 350/350 4x4. He took off the quadrajet and put on a 2 barrel and tuned it as best as he could. Mileage was 2 mpg worse and had now power when towing a load up a hill.
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07-13-2006, 09:00 PM | #18 |
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Re: Goin' back to old school carb?
Do you think a quadrajet would work on a 307?
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07-13-2006, 09:47 PM | #19 | |
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Re: Goin' back to old school carb?
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