The Stovebolt Site Forums The Shop Area Engine Shop Rochester B carburetor upgrade

Is there a good upgrade for a Rochester B carburetor on an inline 235? I have about 1500 miles on the engine since rebuild, and the engine is bone stock except for hydraulic lifters.

I replaced the original carburetor with a rebuilt / refurbished unit from Kragen when I had the engine redone, and driveability seems to have suffered since then.

I seem to be running okay around town, but at at freeway speeds (60 - 70 mph) it feels like the carb leans out a bit and power tapers off. (I have more experience with Webers, so it could just be the feel / sound of the Rochester carb and I'm not familiar with it yet.)

Any ideas on where to start? I'm open to any options to shore up performance a bit. Is there a Rochester FAQ somewhere that I can check out?

Thanks!

There are a few different types of one barrel roch carbs. My '54 ran a little better with a newer I think it's like a '62. Has a bigger top throat opening with a center screw for the air filter. Also this type has a built in opening for a small fuel filter. You going 60-70 with your 235? What vehicle you got?
Beunos Noches, Kip

At second glance, I think that the carb is a Rochester C, as stamped on the top front of the carb. It does have the center screw air filter, but no built-in filter. I have a 1961 Chevy K10 pickup, and top speed seems to be around 80 - I only drive that fast in the truck when I'm trying to get out of someone's way, and only in very short bursts The gearing is really, really low, and I tend to avoid freeways at all costs any more.

Based on your reply, is the current performance in line with what I should expect? I dont' have a frame of reference for the motor, in terms of performance or fuel economy. Thanks!

1961 K10

Troy,
Have you considered a Roch. 2G. They are great carb and I'm sure an adapter would be easy to find or make-up.
Bob