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Time For New Carb?
#1
Hey all,

I currently have an Edelbrock 1406 600 CFM carburetor on my 351C-4V. I have rebuilt the carb a few times over the years with official Edelbrock kits. The thing is all beaten up on the outside and I think I would love a new carb. Can anyone give me some advice? I have been thinking the Holley Street Demon 625 CFM Carb would be a great replacement but I would love to hear what everyone else thinks.

Engine is a stock 351C-4V with edelbrock intake manifold

Thanks
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#2
You have an M code 4 speed correct? You’re carb is undersized. I personally would be running a 750 with mechanical secondaries. A little more work getting it tuned properly but once it is makes a huge difference. This has been debated many times on here before. Due to head and valve design of the Cleveland they like a larger carb.

'73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

'73 F code convertible. Bright red. Needs total restore. (IE HOT MESS)

- Jason
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#3
Good to hear I knew my engine was being choked out. The previous owner gave me that carb on the engine and I haven't replaced it since.
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#4
Quick Fuel makes a nice 750 DP. It is based on the Holley but slightly less expensive and IMHO a better carb.

'73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

'73 F code convertible. Bright red. Needs total restore. (IE HOT MESS)

- Jason
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#5
(02-06-2018, 09:00 AM)73pony Wrote: Quick Fuel makes a nice 750 DP. It is based on the Holley but slightly less expensive and IMHO a better carb.

 You took the words out of my mouth. If I was to replace my Holley Street Avenger 670, which works very well on my 351 C 4V manual trans car after a bit of tweaking / modifying, that's exactly what I would chose............. and at the same time, I think I'd spring for that Blue Thunder manifold  as well.
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#6
Also,

Wanted to mention that I have not heard great things about the Demon carbs. My biggest concern with their design is that with the smaller primaries you might get a slightly crisper throttle response at part throttle but with the oversized secondaries I have heard complaints about a bog or hesitation from several people when transitioning to WOT that can be a nightmare to tune out.

'73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

'73 F code convertible. Bright red. Needs total restore. (IE HOT MESS)

- Jason
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#7
I also have heard a lot of bad things about the demon carbs. I use Quick Fuel on all my stuff.

Kevin

1971 Mach 1
408C Stroker
C4 w/3,000 stall
8.8" Rear w/3.73's
Disc brakes all way around.

[Image: 28ivsix.png]




                                                                                             
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#8
+1 on the Quick Fuel, I have a 650 on my cleveland.
Thanks, Jay
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#9
Would I want vacuum secondaries though if I am using it for just street use at the moment? I heard mechanical secondaries guzzle gas

edit: I suppose it doesn't matter since I'm not driving it every day
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#10
(02-06-2018, 10:06 AM)icejawa Wrote: Would I want vacuum secondaries though if I am using it for just street use at the moment? I heard mechanical secondaries guzzle gas

edit: I suppose it doesn't matter since I'm not driving it every day

I'd go for vacuum secondary's, but with a quick change cap ( red arrow) so you can change springs in a heart beat to get the response you want. In other words the "KISS" method.
Just my thought on it.
Geoff.


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