Street Demon 625 info/advice on a 318

Aesellitto · Mar 15, 2016

I am thinking about replacing the old carter AFB 625 carb and am leaning towards the street demon 625. Has anyone had any history or advice on them? I have a basic 318 stock engine with an edelbrock performance intake. The reviews seem to be good on them and they seem to be an easier carb in the adjustment category. Only downfall I see is installation on a Chrysler engine for the throttle and kick down. I do plan to upgrade with a rebuild and a mild cam in the future and this carb seems to be suited and can adaptable. I live I georgia so the polymer bowl is very appealing to keep the temp down during the intense summer heat.

Aesellitto · Mar 18, 2016

No one seems to have an opinion on the street demon carbs. Went ahead and bought the 1901 625 cfm street demon. Super easy install. Even easier adjustment. Secondary air valve is adjustable on the car in under a minute! The car is running super smooth, easy starts (even with the recent 80+ weather today). Very pleased. Hopefully it holds up.

Cranky · Mar 18, 2016

I know nothing about them but if it's anything like a TQ, it should work well.....

SlinktRR · Mar 18, 2016

First review of a street demon on a mopar that Ive seen. I always wanted to try one but I need 750+ cfm. OP should ditch the original factory kickdown and use the bouchillon or lokar kit, then you can use any carb you want!

Mike67 · Mar 18, 2016

I bought one for my wife's 68 mustang, it fired right off when I got it, having problems now with it starting now the car has been sitting a week.... The whole fuel system is new . Holley is being very supportive with advice and recommendations but I'm not to impressed at this point....The car is brand new and have not even gotten it out to stretch its legs to see how it performs. Realy like the idea of the smaller primaries.... Just have to figure out if it's a tuning or mechanical issue.... Make sure you have a tight throtle return spring , the fulcrum where they say to attach it seems kind of high and does not allow the spring to return completely....Good luck!

Barnmansbee · Mar 18, 2016

I have one on a Pontiac 400 with a 4 speed n 3:08 gears. I have the 625 standard bowl street demon $320 job. I like it and it's not failed me yet but I don't think it's giving me big enough jets right out of the box for a 400 with a big cam. My car hunts a little back n forth when I'm cruseing at 60 mph so I'm assuming I'm a little lean. I wish I would have gone with the 750cfm they offer for my application. I think the 625 will work awesome on a 318. I just think that a lot of engineering went into this carb considering today's gas formulation. All the seals gaskets n such will hopefully hold up better than the older style eddy n holleys.

Aesellitto · Mar 19, 2016

I placed the return spring right at the throttle pin that I made for it. That was the same locaton that my carter was mounted. Seems to work pretty good for me. Starting is pretty decent. A lot better than the carter. Hope you get yours sorted out.

Auggie56 · Mar 19, 2016

Shop around for price. Jeggs so far is the cheapest for the 750. Is there anyway you can hook a hard line on them ? I see only one's with the nipple for neoprene hose.

Coronet 500 · Mar 19, 2016

Have one on my 318 with a Ed Performer and a Comp XE 256 H cam and like everything about it.

Mike67 · Mar 20, 2016

I messed with it all day today, bought different springs, shortest I could find. Seemed to help but there still seems to be a point that hangs up that keeps the rpm up above 200 rpm more than I want. I think I got the idle circuits dialed in also. One thing I highly recommend is to make sure all the screws are tight. I was setting my choke and I notice the butterfly would only open so far and after looking, at the butterfly in the primary bore was very loose and causing the thing to stick. I checked the other and it was loose, as well as the covers for the metering rods. Tomorrow I'm probably going to pull the thing of and check the screws on the bottom just to be sure....

Aesellitto · Mar 20, 2016

Good to know. I have heard others with the same issue. I may will also check mine. Don't need a rogue bolt down the intake.

Mike67 · Mar 20, 2016

First off sorry for the stupid auto correct, I do this on my tablet and sometimes forget to proof read.... Anyway I went back to the shop today turned the ignition gave two pumps and it lit right off.... I still need to get it out and see how it does....I bought mine on eBay as a factory refurbished unit for $239 from Holley...I figured it was worth a $100 gamble...we'll see...

Street Demon 625 info/advice on a 318

Aesellitto

Member

Aesellitto

Member

Cranky

Banned Henchman #27

SlinktRR

Well-Known Member

Mike67

Well-Known Member

Barnmansbee

Member

Aesellitto

Member

Auggie56

FBBO Gold Member

Coronet 500

Well-Known Member

Mike67

Well-Known Member

Aesellitto

Member

Mike67

Well-Known Member

Similar threads