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Mod | | | Forums66 Topics128,165 Posts1,056,992 Members48,458 | | Most Online14,466
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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Sep 2005 Posts: 46 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2005 Posts: 46 | Looking for some real life examples of before and after installing a single Holley Webber. My application is a box stock 235 in my son's 60 short step. The rochester starts and runs well but he buys his own gas and am looking for some improvement in mileage since gas is 3.50+.
Thanks for any info. | | | | | Joined: Oct 2005 Posts: 1,317 Shop Shark | | Shop Shark Joined: Oct 2005 Posts: 1,317 | I've run a Holley/Weber on my 57-235 in an AD truck and would highly recommend the setup. As for any great increase in mileage I don't think you're going to be overwhelmed by that partiular part of the change. I think a properly tuned Rochester would provide as good fuel economy. This however, is where the H/W modification shines. My experience with 50 year Rochester carbs has been that many are excessively worn in the throttle rod area, the air horns are warped, they don't seem to provide a good idle, and have flat spots and hesitation that effect higher speed operation. All of these conditions are eliminated with the H/W.....right out of the box.
The installation is straight-forward, the linkage kit is easy to assemble and adapt to the existing linkage, and tuning is simple. I would recommend the 12v electric choke upgrade ($12.)
Fuel mileage is a very subjective area....the state of tune, driving habits, gearing, and terrain all have a major influence. From my own experience my overall mileage with the single H/W on the 57 engine and the dual Carter /Webers on my 1960 modified engine average between 18-20 mpg.
To me, the big plus with the H/W setup is the improvement in overall performance and the loss of the gas smell from the engine compartment as well as in the cab. I've documented both the installs in my Webshots albums if you'd care to browse.
Dave | | |
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