The Stovebolt Site Forums The Shop Area Engine Shop 2 barrel carb for 235

Just wondering if anyone has tried this or has any experiance with upgrading a new intake and 2 barrel on a 235...How the motor ran and any good details on the upgrade... Iv heard someone say it wont work and wont run right and then got someone insisting on it to get the max out of the motor on a slow running truck, 66 GMC LWB. Any info appreciated, (and BIG CHEVY heres my start of questions lol)

clifford makes a manifold that depending on the adapter you put on it can use a 2 or 4 barrel. from what I hear, it runs very well. If I had known then what I know now, I would have went this route. The only issue is you almost need to use their headers, it will work with the fentons if you do a little grinding according to the fella at clifford

I think you get better performance with duel one barrels because the carbs are spread out between the cylinders more evenly. #1&#6 tend to run lean with one carb in the middle.

I have one Webber 2bl on stock 235...Very big improvement over the stock 1bl. I have had this setup on two trucks. Starts easy, smooth idle and extra power when needed.

I had the Webber on a '72 Datsun 510, so it was free and bought the one to two adapter from Langdon's for $15.00, He also sells the carbs if you need one, about $75. + air cleaner.

I'm sure the two singles will work good also, I have that setup for another truck but haven't tried it yet. Plenty of guys run them on this site.

Do a search for webber. There is tons of reading! Good Luck.

66 GMC?? Probably a 250 not a 235. Offy is the preferred intake. Headers help. Clifford makes some or Langdon's. Carb wise anything up to 500 cfm works. Some use holley 390 cfm ones.
I run a holley 350 2 barrel on an Offy with Langdon's headers on mine. Starts instantly and never misses a beat.

Back in the day, everyone was using Stromberg 97 carbs and I see in the Summit Racing catalog that they are still in favor with guys doing vintage engines.

Why is it that we never hear of these being used or recommended on 235's?

I think its the ~$450 for the Stromberg 97 or the ~$380 for the Edelbrock 94 compared to the ~$90 for the Holley Weber that prevents there being a lot of interest in the 94/97 replicas. The guys who value originality over functionality aren't going to be interested in anything except a Rochester B or a Carter YF. The guys who only care about functionality are't going to spend 4-5x the price for 1x the performance. IMHO

regards,
Leon

The 97 was popular because they were cheap, and there was no cheap 4 bbl.
Neither of those things are still true.

I was thinking about machining the intake to accept a 302 GMC 4 bolt carb or one off a Pontiac or Buick straight 8 so I would have a vintage looking carb.

I ran a 2 bbl on my 235 and I got more rpm on the top end, along with more power, and I was able to increase my top speed from barely 60 up to about 72. It was a good mod.

Were these synchronous or progressive 2 bbls?

What model carb did you use?
What adapter did you use?

I use a Weber 32/36 DGV, which is a manual choke & progessive 2bbl.

DGEV=electric choke

There is a Weber 38/38 that is a synchronous...but I have never used one.

Thanks, Jim,

What base-adapter, if any, do you use?

Hi Tim, I bought the base adapter from Langdon's for about $15.00 two bolt to four bolt alum. He should have a picture on his website.

btw...your blue burb!!!...one of my all time favorites. I hope to have a 54-55 panel someday.

Thanks, Jim,

Here is another source for that adapter. I'll look for those carbs and see if I can find specs on them (for use of one on a 261).

If you really want it to pickup in performance call Clifford Engineering in Wildomar, CA. They have a Weber 38 carburetor that when installed on a stock intake manifold will bring that thing to life. No kidding. It is a $500+ item but it is really well engineered and trouble free. The simple but dependable design of that Weber is amazing.

Jim:

I'm interested in what the linkage setup looks like with your Weber 32/36 DGV. I've been thinking about changing to a 2 barrel and keeping the manual choke on my 235. Do you have any pictures?