Review on 🔥 Demon Street Demon Carburetor 1901 with 625 CFM by Jesse Francilme

is amazing. I replaced the 650 cfm holly with this vacuum secondary carburetor from this 1901 Demon. I, like others, was a little concerned about using this smaller carb and having performance issues. The old Holly carburetor drove me to hysterics trying to tune it to my needs. I could never get it right. Like other people, I have watched many videos and read forums about these sacred demonic carbs. some good news and some bad news. So I decided to try one out to see how it compares to the old school Holly 650. Well, I'm here to tell you that there's no comparison at all. Holly advertises this carb as a 30 minute install and very little tweaking to get you up and running in no time. My install took a little longer because I check the base timing, vacuum and fuel pressure before stripping the old 650 down. Installation went well with the included hardware that came with the new Demon carburetor. I upgraded my fuel system to an electric fuel pump mounted on the fuel tank. After I fully installed the new carburetor, I followed Holly's instructions for filling the fuel tank with an electric fuel pump. It is very important to do as they tell you. then i turned the key to start. Instantly fired up with power. The electric shutter worked perfectly and after a few seconds when the gas pedal was pressed the high revs dropped to around 750 rpm. I set up the IDE where I like it and took it for a quick test drive. 1977 Ford F150 car with 400 cu engine installed. about 400hp Before the test drive I installed new spark plugs to make sure the air/fuel mixture was even. I was gone with the truck warmed up to 180. All I can say is fucking wow. it worked fine on the old holly but now i know what i was missing. there is no swamp that never is. A small open dinner adds another wow. I checked the spark plugs and did a vacuum test to make sure the mixture was fine. it was very tight, could have been a bit skinny. these 400s work a little better, a little richer. In my opinion you won't find a better carb than this. I'll play with it again, but it's good. I want to thank you Holly if you could see my wife's face light up during our cruise on Saturday. walked the aisles like never before. My wife has been battling cancer for two and a half years and this great achievement puts a big smile on her face. Thanks again for a great carb. happy cruise.