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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Sep 2007 Posts: 8 New Guy | | New Guy Joined: Sep 2007 Posts: 8 | Do you recommend dual carbs for a 235 inline six. Does it improve the performance a lot? what about gas milage?
Richard Gaglio
| | | | | Joined: Nov 2001 Posts: 217 'Bolter | | 'Bolter Joined: Nov 2001 Posts: 217 | I love my Cater / Webers from Tom Langdon. I did all of my conversions at one time so, determining which was the money best spent, I'm not sure. I'm only getting about 15 mpg but I'm still tweaking on it. Probably my favorite upgrade was the HEI I like getting in and it starting right up, no grinding away to start!! You can't go wrong with Longdon's stuff give him a call he's extremely informative. | | | | | Joined: Oct 2005 Posts: 1,317 Shop Shark | | Shop Shark Joined: Oct 2005 Posts: 1,317 | I've been running a dual Carter/Weber setup on my 235 for the past 7000 miles......eliminated all of the issues with the stock Rochesters. My fuel mileage hovers around 18....the E10 fuels put an end to my visions of 20+.
As for "performance".....if you mean "kick-in-the-pants" type stuff you might be disappointed. However, getting a clean burn on all cylinders, decent mileage, and the "WOW" factors at all the shows from folks that have a history with the Chevy 6.....priceless!!!!!
Dave | | | | | Joined: Dec 2003 Posts: 1,554 Shop Shark | | Shop Shark Joined: Dec 2003 Posts: 1,554 | Although you may up your gas mileage a little by changing carb setups,the real results will come when you change your final drive,rearend to a higher gear.Most of the old trucks even the 1/2 tonners used at least a 4;11 rearend and some even around the 4:56 mark.My 55 is still running a stock 3:90 rear,which will cause it to lose a lot on gas mileage. However I am also using an overdrive 700R4 tranny which works out just fine.Way too many people on this site thinking that carberation is the answer to fuel economy.First things first,check to see what rearend gears you are running.Get that gearing up to about 3:42 or even 3:08,and you will see a big difference. | | |
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