625 street demon

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   anybody try this carb yet....I have run a 625 carter-edlebrock  pulls stronger on bottom end.
I now run a 650 holley vacumn secondarys, pulls stronger on top end.
Both run 13.2 @1o6 mph
It would seem to me that the New street demon with 3 stage venturi and Goggle Value
might split the difference and run strong all across the board and maybe pick me up a tenth or two??

running at 5800 feet with thin air....
Edlebrock heads, airgap intake, 401 - 69 AMX , 354 gears, 534 lift Bullet cam, 4 speed

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oleblue69 Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Apprentice Joined: Jan/10/2008 Location: Colorado Status: Offline Points: 168	Post Options Post Reply Quote oleblue69 Report Post Thanks(0) Quote Reply Topic: 625 street demon Posted: Apr/23/2014 at 8:39am
	anybody try this carb yet.... I have run a 625 carter-edlebrock pulls stronger on bottom end. I now run a 650 holley vacumn secondarys, pulls stronger on top end. Both run 13.2 @1o6 mph It would seem to me that the New street demon with 3 stage venturi and Goggle Value might split the difference and run strong all across the board and maybe pick me up a tenth or two?? running at 5800 feet with thin air.... Edlebrock heads, airgap intake, 401 - 69 AMX , 354 gears, 534 lift Bullet cam, 4 speed
	JS

Boris Badanov Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4209	Post Options Post Reply Quote Boris Badanov Report Post Thanks(0) Quote Reply Posted: Apr/23/2014 at 11:25am
	To many variables left out to make a guess. What Manifold? Header tube diameters? Your shift points (RPM) 13.2 is pretty excellent for a street car on street tires. 106 mph says you are making around 350 hp to the wheels, very good there also. Excellent numbers fo a mile high street car! You should be solidly in the mid 12's at 114 at sea level. I am of the opinion that your carb(s) is a tad small, especially if you are using a dual plane manifold.
	Gremlin Dreams

BDCVG Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: Dec/19/2007 Location: Endless Mtns. Status: Offline Points: 993	Post Options Post Reply Quote BDCVG Report Post Thanks(0) Quote Reply Posted: Apr/23/2014 at 1:25pm
	13.2 is screamin' but I too think something in a 750 cfm tuned for Your alt. would work better.
	1970 AMX 390 5 spd full Control Freaks front and rear suspension 2014 E63 AMG-S wagon 1965 Austin-Healey 3000 MK III

348AMX Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: Jul/03/2007 Location: Massachusetts Status: Offline Points: 4165	Post Options Post Reply Quote 348AMX Report Post Thanks(0) Quote Reply Posted: Apr/23/2014 at 1:30pm
	With that cam and gear A 750 Double pumper would be what I would try next.

Boris Badanov Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4209	Post Options Post Reply Quote Boris Badanov Report Post Thanks(0) Quote Reply Posted: Apr/23/2014 at 5:20pm
	I missed the manifold note. IMO you are under carbureted. I would like to see a 900+ CFM spread bore carb on that rig. Something along the lines of a carter Thermoquad.
	Gremlin Dreams

oleblue69 Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Apprentice Joined: Jan/10/2008 Location: Colorado Status: Offline Points: 168	Post Options Post Reply Quote oleblue69 Report Post Thanks(0) Quote Reply Posted: Apr/23/2014 at 7:47pm
	Thanks for the replys guys.........but running at 5800 feet is a WHOLE NEW BALL GAME....... 625 to 650 CFM ...plugs are right color. Ya need lots of Velocity up here........I tryied a 750 Edlebrock and put small jets and appropriate rods....runs too rich. Looking for someone whos tried the new STREET DEMON.....with Goggle valve. Check out the web site and the videos they link to. http://www.demoncarbs.com/ SWEET CARB, all new design from scratch.....and you can adjust where the vacumn secondaries come in with a screw driver. Not putting in different springs like the Holley
	JS

oleblue69 Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Apprentice Joined: Jan/10/2008 Location: Colorado Status: Offline Points: 168	Post Options Post Reply Quote oleblue69 Report Post Thanks(0) Quote Reply Posted: Apr/23/2014 at 7:56pm
	oh yeah HOOKER HEADERS 1and 3/4 ceramic coated...........scorpion roller rockers.... Ross forged pistons 10:1 compression At this altitude you loos one full point of compression......so its like 9:1 at sea level. Heck with the aluminum heads i shouldve gone with 11 to 1 Jeff
	JS

Boris Badanov Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4209	Post Options Post Reply Quote Boris Badanov Report Post Thanks(0) Quote Reply Posted: Apr/24/2014 at 5:08am
	Spread bore carbs like the Thermoquad and Quadrajet give excellent velocity with big flushmaster secondaries.... If the 750 Edelbrock is anything like the old 750 Carter they are junk. No suprises there. I used to run two Carter Comp series 625 AFB's on several different motors including a AMC 360 and 390. They worked awesome right out of the box despite needing a little enrichening on the secondary side during drag race tuning. Single or dual 750 Carters were a failure. I was at sea level. If i could squeeze three of those 625s on a manifold, I would :-)
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390spirit Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: Jun/28/2008 Location: U.S.A. Status: Offline Points: 1849	Post Options Post Reply Quote 390spirit Report Post Thanks(0) Quote Reply Posted: Apr/24/2014 at 6:38am
	its a stick car..... get away from the vac. secondaries and put a double pumper on it and enjoy the newly found power!

FSJunkie Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: Jan/09/2011 Location: Flagstaff, AZ Status: Offline Points: 4742	Post Options Post Reply Quote FSJunkie Report Post Thanks(0) Quote Reply Posted: Apr/24/2014 at 1:51pm
	You won't find many people around who will have anything good to say about the Street Demon, not because it's a bad carburetor, but because thy are all stuck in their old ways for what works for them and this is a new carburetor they've never tried. "Like a frightened baby chipmunk, you are afraid of anything that is different!" -Jean Girard Bolt it on and try it for yourself. Here' a secret: 90% of what you read online is biased opinion, meaning take it with a grain of salt. ------------------------------------------------------- I love the Street Demon. I've never run one, but I've studied them as much as I reasonably could and love the design. If I was the aftermarket carburetor kind of guy, it would be one of two carbs on my list next to the Summit Racing VS. But I'm not an aftermarket carburetor guy. Edited by FSJunkie - Apr/24/2014 at 1:56pm
	1955 Packard 1966 Marlin 1972 Wagoneer 1973 Ambassador 1977 Hornet 1982 Concord D/L 1984 Eagle Limited