THe bolt pattern is too wide. I have a 305 with some other gm aluminum intake manifold that I found at a junk yard. It seems to fit my holly just fine but.. I have a feeling that holly has parts from 4 different carbs so I couldnt tell you what model it is. Is there some kind of adapter that I can use at a local parts store? This is kinda disappointing, I should have done a bit of research before ordering the carb.

Thanks

Specification Charts

132-4282020VE-R
JEGS High Performance - Demon Road Demon Carburetors

 

Something sounds screwy here. It should be a standard square-bore flange, just like a standard square-bore flange Holley.

Any chance you can get photos of these carbs side-by-side?

 

opps, I thought I re-posted but.. when I get that tired my typings make little sence. I'll go ahead and answer a few of my questions for reference in case anyone with a Demon 525 and similar intake manifold happens to search for this one. At the time I was just looking for the quickest fix cause I needed my car asap.

Question #1
> Do local parts stores carry an adapter for my demon to intake manifold?
Answer
> Yes, you will find that that cheap brand "Spectra" or another has this, it is 24 dollars and looks similar to the one within the below link.
JEGS High Performance - Holley Carburetor Adapters

Question #2
> Does the local parts store carry a fuel line that can be used for this carb?
Answer
> Commonly no, I have found one but it was an inch to short. The threads may or may not have fit.

Lesson learned.. ORDER THESE PARTS WHEN YOU ORDER THE CARB!! You just cant expect things to bolt right on. Take the time to look into the measurements. If you dont have to time to do that at the moment, learn the hard way and burn more time then necessary like I did.
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Rumor has it that for some reasons Demons went with a wider bolt pattern. But thats just what one other owner of a Demon said. He may have seen a few of them, seems to be true so far. I probably could google for threads with others that have the same problem.. if I were so motivated.

 

I've never heard that, and their website doesn't indicate anything like it.

Squarebore is wider than spreadbore, believe it or not. I'd like to see the measurements of the bolt hole spacing from each carb, and the manifold.

 

look at the holly adapter link that I posted above, the difference is on the adapter

 

ha.. I just found my post through google accidently. Well I might as well post an update on how its going. I had to get an EGR block off plate because the carb doesnt fit next to it but thats common. It wont pass emissions like this so.. I'll just move to a different state. I did have to order the fuel line from Bary Grant. I just used the local speed shop as the middle man, had them hold the part till I could pick it up. Note that the double fuel inlet hose that takes a push on style connector for rubber hoses Doesnt fit the carb so easily right out of the box. Its because the type of screw on thread at the back is not the kind that you can hold your hose in the direction that you wish it to go and turn the nut. The whole hose must turn. The other end of this part has the T connector on it, same deal at that end, whole hose must turn when tightening down the threads. This leaves a bad situation because the end of the T connector was pointing away from the carb! The trick is to place an extra hard style gasket between the rear fuel inlet connector and the carb. This will change the position of your threads and in a domino effect it will change which direction that T connector faces. One small hard style gasket (with the metal in the middle) seemed to change the direction of where the T faced by 25 - 30% . I know I didnt word this very well and its hard to get a mental picture of it if you havnt held the parts in your hands before but to save yourself this trouble, make sure you get the kind of hose that... when it is off of the car and in your hands, you can turn the nuts on the end of the hose without the hose itself turning. This! will make a world of a difference!

btw... here is a great link with tons of demon related info

http://www.barrygrant.com/fromBarryG...r%20Manual.pdf

 

The 525 Road Demon Jr. is a standard squarebore bolt pattern. Back in the mid-50's to mid-60's Chevy had a smaller bolt pattern for very small bore Rochester and Carter 4 bbl carbs. They were replaced in 1966 with the q-jet. Those intakes all had an oil fill tube in them. Holley may have made a carb to fit that old, small pattern, but it certainly isn't a standard square-bore pattern if it does (and I don't remember ever seeing such a Holley). None of the adapaters you linked would work to adapt the RD Jr. to such a manifold.

 

Well.. thats nice to know but.. I dont have a Road Demon Jr. dude. Thanks for the info and all but the adapter that I got fits just fine, its already on the car with the carb sitting on it.

 

meh.. so I'm going through this check list.. says to adjust the float level while the engine is running. Ok.. so I loosen the lock screw and fuel starts leaking out of it!! lol shut the engine off.. ok.. so I guess that it has to be semi tight, just loose enough to turn the nut which rotates this needle, lowers the float level. So I tighten the lock screw to a point where it stops leaking gas and give the nut a turn.. not even sure if I got to 1 rotation of 360 degrees before the needle BREAKS OFF!!! oh no.. back to the same problem different carb, carb is shooting gas straight up. I pretty much just cut the engine off and called it a night. Now this is a "4 barrel Road Demon 525, electric choke" I'll need another needle but I'm not sure which size. From the description it looks like I need the smaller of the 3. I've got a feeling its a .110'' but I need a 2nt opinion. Spring loaded? That "sounds" like a nice option.

132-120006 .110'' Needle & Seat - Pair
132-120013 .130'' Needle & Seat - Pair
132-120014 .110" Needle & Seat, Spring Loaded - Pair
132-120005 .150" Needle and Seat - Pair

JEGS High Performance - Barry Grant Needle & Seat and Components

 

Regardless, they both have the same bolt pattern.

 

That link takes you to the Road Demon Jr instruction manual. People don't often make the distinction between the RD & the RD Jr, and since they bolt on to the manifold in the same way, your questions/comments didn't need the RD vs. RD Jr distinction.

Since people often learn by searching the Board, I'd prefer they learn correct vs. incorrect information through their efforts. I'm sure you can appreciate that.

Oh, it's a common thing for fuel to spurt out when you loosen the float adjust lock screw. Getting the balance between minimal leakage and being able to turn the adjusting nut never seems to turn out the way you would like.

 

What a hack job this is turning into. I still have the fuel pump from the FI and a regulator thats bringing it down to 15psi, then another regulator that brings it down to around 13 psi. Still way to high and I cant drive it like that. I was looking at some regulators on jegs as I was surprised to find that they range from 30 to 300 dollars! For those prices I would just replace the fuel pump. I need to do that anyway, cant keep this high pressure system... Does anyone know if there is an easy way to get to the stock fuel pump, some panel above the gas tank? or do you have to drop the whole tank?

I'm in no rush now as a new problem just came up. Not sure why but now oil is spewing out of somewhere and dripping from the flywheel cover. Thats...