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#1 |
Registered User
![]() Join Date: Jun 2014
Location: Shingle Springs, CA
Posts: 869
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Which Edelbrock Carb 500 or 600 cfm?
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#2 |
Registered User
![]() Join Date: May 2013
Location: Sacramento, CA
Posts: 487
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Re: Which Edelbrock Carb 500 or 600 cfm?
I like seeing trucks with their little 283s still in them. I have a replacement 283 bored .30 over just waiting to get dropped in. I have a 600 cfm Edelbrock sitting on top right now. I don't know the answer to your question but looking forward to the answer.
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Rich J. 1967 Chevy C20 Longbed Stepside w/283 and 4spdSOLD ![]() 2002 Chevy Tahoe 4X4 5.3L SOLD 2015 Chevy Silverado Crew 4X4 5.3L |
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#3 |
Registered User
![]() Join Date: Nov 2013
Location: marshall, il
Posts: 282
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Re: Which Edelbrock Carb 500 or 600 cfm?
Everyone will have an opinion on this subject but mine is that a 500 will put out all the fuel you can burn without rich type smoke. I had a 780 on a 454 that wasn't stock but it wasn't a radical engine either and I had to choke the jetting down quite a bit to get it just right. I'm building another truck now and going with a 383 and I'm just going with a 600 holley. A lot of people will argue with me but I personally like the holleys because I growed up playing with them and can work on them easier.
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#4 |
Registered User
Join Date: Oct 2010
Location: Kansas City
Posts: 3,590
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Re: Which Edelbrock Carb 500 or 600 cfm?
If you go to Holley.com there is a carb sizing tool. It will recommend Holley carbs, but will also make recommendations on cfm, etc. When I used it for my bone-stock 350, it came back with 400 cfm.
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Willie Swamp Angel Truckers '72 C10 Highlander ![]() People who blindly follow a GPS end up on television programs on The Weather Channel. Some survive, some don't. ![]() |
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#5 |
laying low
![]() Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,272
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Re: Which Edelbrock Carb 500 or 600 cfm?
That's where a quadrajet makes sense. Small primaries for good street manners and economy and large primaries for power when you want it.
Cool truck you've got there.
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Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross |
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#6 |
Registered User
Join Date: Dec 2011
Location: Creighton Sask. Canada
Posts: 4,121
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Re: Which Edelbrock Carb 500 or 600 cfm?
If it is just a cruise around truck then would recommend the 500, better street manners, but if your an RPM kind of guy and like to push it then would step up to the 600, either way can't really go wrong though. My choice of a dependable carb.
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1987 Green n Green machine. 5.0 4spd std. 7" lift w 35's. |
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#7 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,628
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Re: Which Edelbrock Carb 500 or 600 cfm?
My first thought is what's wrong with the holley carb you got?
Changing carbs might only make your wallet lighter. Tell us what it's doing. And btw your heater hoses are on wrong. Intake to the bottom of the heater core, top of core back to the pump. |
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#8 | |
Registered User
![]() Join Date: Jun 2014
Location: Shingle Springs, CA
Posts: 869
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Re: Which Edelbrock Carb 500 or 600 cfm?
Quote:
When I got the truck the carb was black inside and it was running rough and it had backfired a couple times. I reset the timing to 9 degrees TDC and adjusted the idle. Now no more backfires. Now when I put the truck under load after it has been running for a couple mins it wants to stall. I have to really rev it (2,000 rpm) to get it up a hill. It sounds like its sucking a lot of air. I don't have to rev it as much if I let it sit and warm up for awhile. It has a electric choke. I found the Holley manual online and was going to read it tonight. Thanks for the info on the heater hoses. ![]() ![]() |
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#9 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,628
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Re: Which Edelbrock Carb 500 or 600 cfm?
Sounds like the normal lack of initial timing scenario.
Did you set your initial with the vac line to the dizzy plugged? If so bump it up to 14 degrees. If it gets better then try a couple more degrees at a time until it's hard to start when hot or it pings. Make sure you turn your idle speed down as low as possible when you set your timing. |
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#10 | ||
Registered User
![]() Join Date: Jun 2014
Location: Shingle Springs, CA
Posts: 869
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Re: Which Edelbrock Carb 500 or 600 cfm?
Quote:
Quote:
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#11 |
Registered User
Join Date: Oct 2008
Location: Marianna Arkansas
Posts: 7,270
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Re: Which Edelbrock Carb 500 or 600 cfm?
I have had lots of people come into or call my shop and ask carb questions, more so back when I was real big into the hot rods motors and drag racing and bunches of power and stuff like that. I had a answer for them that I go by on my rides. I your gonna ride around and every once and a while flog it or drive it like you stole it, put on a Edelbrock. If your gonna race and do some riding around every once in a while get a Holley. Now many will disagree and proclaim I drive 500 miles a day with a Holley well ok. You can but in general the Edelbrock is more of a set and forget type carb. If you put on a good glass filter close to the carb and keep the fuel pressure turned down to no more than 5.5 or else the pressure might override the needle and seat and cause flooding that is the main complaint from the edelbrock carbs. Go with the 500 cfm
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#12 | ||
Registered User
![]() Join Date: Jun 2014
Location: Shingle Springs, CA
Posts: 869
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Re: Which Edelbrock Carb 500 or 600 cfm?
Quote:
Quote:
Ok so I up the timing to 13 or 14 degrees TDC. Not sure since its off the chart. It does seem to run smoother. I also adjusted the electric choke speed faster. So now it jumps up to 1,000 rpm when I fire it up. Before It would stay low at 500-750 rpm and I would have to keep it going. Do I need to be nerves having the timing adv so much? I know the old saying is "running lean is running mean". Also I have a noob question. How do I know when it starts knocking? Is it loud? Will I hear it with my head under the wood or would I need to drive the truck? Thanks again for all the help. |
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#13 | |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,628
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Re: Which Edelbrock Carb 500 or 600 cfm?
Quote:
Every motor combo is different. I ran an aluminum headed 350 with 22 initial, 12 in the dizzy and 10 from the vac pot. |
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#14 |
70+ ( Old Skool Club )
![]() Join Date: Nov 2003
Location: Saskatoon, Saskatchewan ,Canada
Posts: 9,118
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Re: Which Edelbrock Carb 500 or 600 cfm?
I have a 1406 Edelbrock on my 396 that was on the truck when I bought it in 2001. I have never had to touch the carb and it works as its supposed to whether I'm leisurly driving at 30mph or getting rubber betwen 1st and 2nd ( the truck has a TH 400 trans ) so my 2 cent is bolt on on the Edelbrock and forget it.
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1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021 |
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#15 |
Registered User
Join Date: Apr 2014
Location: calgary alberta
Posts: 1,248
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Re: Which Edelbrock Carb 500 or 600 cfm?
600 cfm is more than enough mathematically you would never use it to its full potential with any small block it will always be enough for it no matter what you do to that engine you won't ever use any more than 536 cfm on a small block chevy engine
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#16 |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: Which Edelbrock Carb 500 or 600 cfm?
500 is plenty. If you've got a spread-bore or dual-pattern intake I'd put a Q-Jet on it. Helps if you have someone good at tuning them, but there are only 3 living people left that can do it :-) Otherwise I've had good luck with the Edelbrock (Carter style).
Your open element air filter will make cold start drivability more problematic, but as long as the choke is set right you shouldn't have to two-foot it (my pet peeve).
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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