Looking for opinions on the 750 street demon carb for a 440 moderatly built 440. Specs below. This is a street cruiser in a 67' Belvedere.

Edelbrock RPM heads and intake, TTI 1 7/8 headers, Firecore distributor, 727 trans with 2000rpm stall and 3.23 gears

Hughes CAM-HEH 2832BL
Intake Valve Lift 1.5
Exhaust Valve Lift 1.5 .524"
.540"

Intake Valve Lift 1.6
Exhaust Valve Lift 1.6 .558"
.576"

Intake Duration at .050"
Exhaust Duration at .050" 228°
232°

Lobe Separation Angle 110º

Intake Opening at .050"
Exhaust Opening at .050" 7° BTC
49° BBC

Intake Closing at .050"
Exhaust Closing at .050" 41° ABC
3° ATC

the CFM is in a good range for a 440 & iirc the SD has gotten good reviews. here's a BTT for ya

Thanks

None of the shops in town stock them, the one counter guy went as far to tell me that as Demon was such junk in the past they don't like to even bring it in because no one will buy it.

In that case definitely hang loose & wait for more input. If I was going to spring for a new carb I would want one that has all of the systems adjustable so it can be dialed in spot on (with the LM1)

The Street Demons are the best street carbs out there, in my opinion. They are calibrated better than most and have features that none of their competitors have.

Having said that, they are a pain to tune. And the parts are just about always mail order. I don't know of any place that stocks tuning parts and there aren't that many anyway.

So if you into tuning to a razor's edge, something else might be the way to go. If, however, you want a carb that is the most likely to run good out of the box and have probably the best throttle response, then this is the carb for you.

I ran one of the early 750 Demon carbs for years on a mildly built 440 in a drag car. It worked great and ran 11.2. It should be good on a mild street cruzer 440.

Demon carbs and BG products in general were a real crap shoot when Barry Grant owned the company. Now that they are part of Holley I think they have gotten a lot better. Biggest issues people had were float bowls being full of crap. Pretty annoying on something you just plunked down your cash for.

With no converter and 3.23 gears a 750 should make you very happy.

I cannot speak from actual ownership. I have watched many of the youtube evaluations and advertisements of the Street Demon carbs and it seems this design is a superb STREET DAILY DRIVER high performance carburetor. The designer worked for Carter back in the day and with this carb was allowed to incorporate things to improve on 1970s tech. None of the evaluaters will say it but the street demon is obviously an improved version of the thermoquad. Id love to buy 2 of them for my future 360 dual quad motor but the street demons only come in 625 and 750cfm sizes and I simply want 2 500cfm`s which means ill go Edelbrock.

http://www.mooregoodink.com/news/street-demon-an-interview-with-its-designer/

to small try a Holley 850 0r a Proform 950. I tried a Demon 750 on my slightly less built 440 and even though it had decent low end it lost a lot of top end. I swaped in a pro form 950 body on my holley 850 and oob the car never ran better.

I run the 625 Street Demon on a slightly upgraded 383 and am happy with it. I got the tuning kit, but it came out of the box fine for my mild cruiser setup.

Had a 750 vac one time. An old BG version and can attest to the crap in it. Basically pull it apart and flush the metal shavings and machining remnants out of the metering block and bowls it was fine. Poor QC but good carb.

I think the new Street Demon 1901 (similar in appearance to the old Thermoquad)is a different animal than the old BG Demons(similar in appearance to Hollys). Reviews on the Street Demon 1901 have been pretty good AFAIK.

This new carb is strictly a product of Holley, in fact they are now calling it the Holley Street Demon. Neat thing is it goes on either spreadbore or squarebore and has the great low speed metering of the Thermoquad.

It's a street carb as the name indicates. There are a lot of street cars out there.

I'm sure Holley would tell you to use a square bore carb on a maximum horsepower type engine. Heck, Edelbrock says the same thing.

You should be able to make 450hp with the 750 Street Demon without a lot of fuss. More and I'd suggest a squarebore.

R.