Looking at getting a new carb

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v8vendetta
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Joined: Tue May 09, 2017 2:09 pm
Location: Gillette, WY

Looking at getting a new carb

Post by v8vendetta »

I'm looking at getting a new to me carb. It is a 625 Holley street demon with a plastic bowl and the guy wants $200 for it. He used it for a week and decided he didn't care for it. He is a trustworthy guy too. Have any of you had experiences with the Street demons? Specifically the 625? It will be going on my '76 with the stock intake and a 401. I also have HEI on it. Thanks in advance.

https://www.holley.com/products/fuel_sy ... parts/1901
1976 Jeep J-20
401 V8 w/ CRT HEI conversion
Blown TH-400
--------------------------------------
1989 Grand Wagoneer
360 V8
727
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HeavyMetalThunder_81
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Re: Looking at getting a new carb

Post by HeavyMetalThunder_81 »

They're not great carbs for the street...or any application for that matter. There's a reason he didn't care for it. Also, that will not bolt to your factory intake without an adapter.
-Jonny B.
1979 Cherokee Golden Eagle - UNDER CONSTRUCTION
7" lift, 35x12.5x15
AMC 401 - Pro-FLo 4 FI
NV4500/NWFBB/NP205 - Triple Stick'd
F D44 - 4.10, Eaton E-Locker
R M23 - 4.10, Detroit Locker

1979 Cherokee Chief - Parts
1979 Cherokee Chief - Parts
1979 Wagoneer - Sold
1981 Cherokee Chief - Cubed

Topic author
v8vendetta
Posts: 84
Joined: Tue May 09, 2017 2:09 pm
Location: Gillette, WY

Re: Looking at getting a new carb

Post by v8vendetta »

That bad huh?
1976 Jeep J-20
401 V8 w/ CRT HEI conversion
Blown TH-400
--------------------------------------
1989 Grand Wagoneer
360 V8
727

440sixpack
Posts: 332
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Re: Looking at getting a new carb

Post by 440sixpack »

I'm a Holley loyalist, but those carbs look like a Ronco POS to me. I can't say I have any experience with them but that's on purpose.

Spend a few extra bucks and get a real Holley .

rocklaurence
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Re: Looking at getting a new carb

Post by rocklaurence »

I just replaced my old Edelbrock with one on the Shop truck. I'd take it over a new Edelbrock for the street. However, there's no offroad support for them--like springs for the needles or bowl ike is available for the Edelbrock and other Holleys. Im happy with it.

csuengr
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Re: Looking at getting a new carb

Post by csuengr »

Didn't you hear? Carbs are bad for you.
1977 Cherokee S, Ford 5.0, 5 speed, BW 1356, 33 x 10.50 BFG's. No longer my DD.
2007 Mercury Milan, 2.3L, 5-speed, now my DD. 29 mpg average.
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kansasboy001
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Re: Looking at getting a new carb

Post by kansasboy001 »

Those street deamons are pretty much redesigned thermoquads. They wanted a square bore but with a spreadbore type secondaries so they have a weird 3 barrel design. There's a reason why nobody did that back in the day. It just isn't as good as a normal square bore or a real spreadbore.
1983 Cherokee Laredo. 360/ 727/ np228/ Junkyard 7427 TBI/ Msd ignition
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Stuka
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Re: Looking at getting a new carb

Post by Stuka »

If you do want to use a square bore carb on your stock 4v intake, you need to get an adapter meant for a 70's Ford 460 that came with a 4350 carb. It is NOT a standard spread bore that you find under a quadra-jet or the like.
2017 JKU Rubicon
Pevious Jeeps: 1981 J10, 1975 Cherokee, 2008 JK, 2005 KJ, 1989 XJ
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Stuka
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Re: Looking at getting a new carb

Post by Stuka »

kansasboy001 wrote:Those street deamons are pretty much redesigned thermoquads. They wanted a square bore but with a spreadbore type secondaries so they have a weird 3 barrel design. There's a reason why nobody did that back in the day. It just isn't as good as a normal square bore or a real spreadbore.
There is nothing wrong with the "3 bore" design. The secondary being larger is fine as it is only going to be used under higher loads anyway. Its not going to hurt performance. If it was the primary, then it would hurt lower RPM throttle response.
2017 JKU Rubicon
Pevious Jeeps: 1981 J10, 1975 Cherokee, 2008 JK, 2005 KJ, 1989 XJ

rocklaurence
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Re: Looking at getting a new carb

Post by rocklaurence »

Zero Carbs and all Bacon...Mmmmm

Topic author
v8vendetta
Posts: 84
Joined: Tue May 09, 2017 2:09 pm
Location: Gillette, WY

Re: Looking at getting a new carb

Post by v8vendetta »

The other option is using the trick kit I got for the existing Holley or buying a 1406
1976 Jeep J-20
401 V8 w/ CRT HEI conversion
Blown TH-400
--------------------------------------
1989 Grand Wagoneer
360 V8
727
User avatar

Stuka
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Re: Looking at getting a new carb

Post by Stuka »

If you only drive on the street with minor trail usage, either of those carbs will be fine. The 1406 will be easier to tune.
2017 JKU Rubicon
Pevious Jeeps: 1981 J10, 1975 Cherokee, 2008 JK, 2005 KJ, 1989 XJ

Fast Eddie
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Location: South Lyon, MI

Re: Looking at getting a new carb

Post by Fast Eddie »

I replaced my Holley DP 650 with a Edelbrock 1405 Performer Carb. Night and day better than the Holley and it starts SO much easier than before. Highly recommend a Edelbrock. I did have the aluminum Edelbrock intake already installed by PO. Easy install and tune. Increased my MPG too.
FYI .....
1979 J20, 360 w/NV4500/D300 Twin Stick/3.73 SOLD
1978 Cherokee Chief W/T Levi interior, 360 Q/T. SCRAPPED
1970 Gladiator J4800 Camper Special, Buick 350, 4spd. SOLD
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