lbhsbZ Posted June 21, 2007 Share Posted June 21, 2007 I recently bought a Demon 850 to replace my holley 650hp, which I thought was too small to do what I needed it to do. The 850 runs better, but I dislike the design. Jet changes are a bitch due to the allen head bolts that are countersunk into the casting. With the holley, I crack the bolts loose and spin them out with my fingers....the demon requires a tool to be used to remove the bolts all the way. Does anyone know if holley bowls will work on a demon carb? I suppose I could just get longer bolts and make some spacers, but I've got a bunch of holley carbs laying around. I don't see why they won't work...but I haven't tried it yet. Maybe someone else has? The only things I'm worried about are the accel pump circuits and linkages. Quote Link to comment Share on other sites More sharing options...
SilentNight1647 Posted June 21, 2007 Share Posted June 21, 2007 I've got a Race Demon on the shelf at the house and IIRC the bowls are a different shape altogether than the Holley they are more round and the bowl is actually a semi circle where as a Holley is a square shape, sorry I can't tell you for sure but I'll look tonight when I go home. My Demon got shelved when I bought one of theese best money I ever spent the response is almost as good as fuel injection and it never needs to be adjusted or jetted. http://www.jegs.com/webapp/wcs/stores/servlet/product_10001_10002_743833_-1_10271 Quote Link to comment Share on other sites More sharing options...
A. G. Olphart Posted June 21, 2007 Share Posted June 21, 2007 I've got a Race Demon on the shelf at the house and IIRC the bowls are a different shape altogether than the Holley they are more round and the bowl is actually a semi circle where as a Holley is a square shape, sorry I can't tell you for sure but I'll look tonight when I go home. My Demon got shelved when I bought one of theese best money I ever spent the response is almost as good as fuel injection and it never needs to be adjusted or jetted.http://www.jegs.com/webapp/wcs/stores/servlet/product_10001_10002_743833_-1_10271 How's your mileage with the Predator? I knew a guy a few years ago who tried one, and IIRC, his was thirsty. <> Quote Link to comment Share on other sites More sharing options...
SilentNight1647 Posted June 21, 2007 Share Posted June 21, 2007 oops Quote Link to comment Share on other sites More sharing options...
SilentNight1647 Posted June 21, 2007 Share Posted June 21, 2007 Mine only gets about 7mpg but it's on a 427 race-only big block in a full bodied '71 Nova so it really can't be taken as any indication. I do have a friend that runs one on a 383 in his '80 Cutlass and it gets 16-18 sometimes as high as 20 if he stays out of the throttle so it's not bad. Quote Link to comment Share on other sites More sharing options...
John Scott Posted June 21, 2007 Share Posted June 21, 2007 I recently bought a Demon 850 to replace my holley 650hp, which I thought was too small to do what I needed it to do. The 850 runs better, but I dislike the design. Jet changes are a bitch due to the allen head bolts that are countersunk into the casting. With the holley, I crack the bolts loose and spin them out with my fingers....the demon requires a tool to be used to remove the bolts all the way. Does anyone know if holley bowls will work on a demon carb? I suppose I could just get longer bolts and make some spacers, but I've got a bunch of holley carbs laying around. I don't see why they won't work...but I haven't tried it yet. Maybe someone else has? The only things I'm worried about are the accel pump circuits and linkages. I actually liked the allen heads on my Demon. Easy to keep a small allen wrench in the ash tray and access is better on the back bowls than using a screw driver. My Holley HP needs a small socket hex rather than screw slots. PITA. Maybe my Demon was a bit more broken in, but once a little was exposed past the casting I could spin them out by running my index finger across them, as fast or faster than the holley. Quote Link to comment Share on other sites More sharing options...
280zwitha383 Posted June 23, 2007 Share Posted June 23, 2007 35 bucks for the whole thing? It says kit but shows the whole thing. Surely it can't be that cheap. If so I'm buying one. Quote Link to comment Share on other sites More sharing options...
SilentNight1647 Posted June 25, 2007 Share Posted June 25, 2007 Thats just the bell crank, must of changed the lik on me last week it was the carb itself which retails for about $450. Quote Link to comment Share on other sites More sharing options...
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