1/15/2020 Update: The weather cleared up for a few hours and I was able to go fill up the tank. I think we might have near the most expensive gas in the nation (northern California). This was at Costco, which is usually about 20 cents cheaper than most places, $3.75 is the average for regular right now at most gasoline shops in town. My initial impressions, and I have to stress, initial impressions on a 30 mile round trip mostly highway driving are: In town, on the low end, about the same or perhaps a little bit more grunt than my Rochester. Smoother power delivery, and less jerking when I let off the gas abruptly. The UN2 helps my 261 idle beautifully at 500 rpms. Perhaps smoother that my Rochester did. I can hardly feel the engine vibrate. One thing I did notice with this carb was that when cranking the engine, I did have to tap the gas slightly to start out even when warm, something I never had to do with my Rochester. Now that might be down to the low rpm setting. I believe I was at 600 with my Rochester. High end driving: it definitely has a bit less grunt at the high end. Now this could be attributed to a few things. One, the air cleaner is noticeably smaller, with the larger heavy duty air cleaner I had on my Rochester, when I would gun it on an uphill in high gear, I would get a beautiful metallic vacuum sound that I loved, and you could hear allot more air going in, something im not noticing with this smaller air cleaner. (I have a paper air cleaner I might try to see if this will remedy the problem) Also, I adjusted the high speed jet without the air cleaner on, this might have something to do with the more sluggish power. I must note, that though it does feel less powerful on the top end, its not greatly noticeable, and there are some things I will try to remedy this. I will call the company and see what kind of customer service they give and what kind of technical advice is at hand. So far, im very content with the carb, with that small downside regarding the air cleaner. Ill definitely try to get some more miles on my truck and post anything I find that has merit announcing (weather permitting). Other than that, just see what its like living with the UN2 day to day, and what kind of gas mileage it gives me, first highway miles, then city driving miles.
