[mikew88gt]

I have a 650 Speed Demon and I like it now. When I originally purchased it I had problems but I don't necessarily blame the manufacturer. When I received it from Summit the video in the shipping box was smashed. I put the tape onto another vhs tape I had laying around but thought about returning the shipment. I looked it over real close and didn't notice any damage. After installing it on the car it seemed to run ok at first then ran progrossively worse. I couldn't dial it in and another guy I know had a similar problem. Last winter I totally disassembled it for a rebuild to see what if anything was wrong. Apparently you can use most of the parts from a holley 4150 rebuild kit but Demon didn't exactly come out and say that's ok. Summit couldn't find the correct rebuild kit from Barry Grant for a Speed Demon but thought the 4150 kit would be ok. Anyhow, after the rebuild the carb is much better. My friend that had a similar problem also rebuilt his carb and is very happy with it. Overall I'd say it's a good product. There is also a lot more tech info out on these carbs than there was a few years ago so troubleshooting is a little better. Most articles that do comparison tests (dyno runs) with different manufacturers carbs show the Demon carbs making more power with the same CFM rating. The quality of construction is also top of the line.