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#1 |
Silverado Stew
Join Date: Jan 2004
Location: Ewing, MO
Posts: 184
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I have a chevy 350 with std. bore, std. crank
300 horse double hump heads w/ 202 valves COMP CAM 12-239-3 12-239-3 CS X4 262H-11 Lobe separation 111° Gross valve lift 0.462" Intake @ 0.05 Gross valve lift 0.48" Exhaust @ 0.05 Good low and mid range, excellent response, noticeable idle RPM operating range 1300-5600 Holley aluminum intake (contender) I was wondering what Carb you guys thought would work good with this setup. I had a quadrajet on it that came off a 305 and it ran like ****. I'm probably looking at a remanufactured unit due to money reasons, thinking maybe Edelbrock 750 cfm performer series. It's in an '81 1/2 ton 4x4 Silverado short bed with auto tranny. Open to any suggestions, and thanks in advance for any help. |
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#2 |
Hotwheels?
Join Date: Dec 2002
Location: Pleasant Hill, CA
Posts: 1,145
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Id say 650 would work just fine for a daily driver. 750 is a bit much
I love my edelbrock for reliability purposes. A nice Holly 650 Double pumper would be really nice for that motor though. It all depends on how your gonna use the truck.
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1978 Money Pit - CUSTOM DELUXE!!!! |
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#3 |
Silverado Stew
Join Date: Jan 2004
Location: Ewing, MO
Posts: 184
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I guess it'll mainly be used for a "work" truck. I won't be making many long trips with it, but still want to keep the gas mileage within reason.
I have an Uncle who has a Holly double pumper I can get fairly reasonably, but I don't like the dang power valve going out any time it backfires. One reason I said the 750 is because it is cheaper than the 650! How does that make any sense? I assume I would get worse gas mileage with the 750. |
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#4 |
Slots go on anything!
Join Date: May 2003
Location: Richardson, TX
Posts: 5,957
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I have had good luck with the Edelbrock carbs. I would try to get a 600 or 650 with electric choke. Look at the AFB style carbs rather than the spreadbore types. They are a lot more affordable.
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1974 Jimmy- 5.3/4L80e/NP241 |
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#5 |
Hotwheels?
Join Date: Dec 2002
Location: Pleasant Hill, CA
Posts: 1,145
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Yeah, I hate the Holleys because they are harder to tune and the power valves.
They are good for drag cars and thats about it. Id get an edelbrock 650 squarebore for milage and reliability purposes.
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1978 Money Pit - CUSTOM DELUXE!!!! |
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#6 |
Mudslides 'r my specialty
Join Date: Dec 2003
Location: STL
Posts: 1,106
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I would go for the Edelbrocks, especially if you have emissions.
Edelbrock makes a carb specifically for our trucks (795 cfm), but it's about $500. Is this one better than the other electric choke Edelbrocks?
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Always on the lookout for old cars and parts...(20s, 30s, 40s, 50s, 60s, etc.) http://www.cardomain.com/memberpage/500339 |
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#7 |
Account Suspended
Join Date: Dec 2003
Location: Texas
Posts: 2,686
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You can buy a kit to prevent the power valve from blowing
Properly tuned engine shouldnt backfire but it does happen Id suggest a 600 edelbrock you can get them at any autozone for about 210 manual choke 240 electric choke The electric choke is calibrated more for mileage The manual choke is calibrated more for perfomance. |
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#8 |
Registered User
Join Date: Nov 2003
Location: st. louis area
Posts: 1,551
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if you plan to run it to 5600 RPMs or so, & dont want to use a Qjet, my pick would be a Demon 625.
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75 GMC C-15 short/step factory 454, lowered |
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#9 |
Slots go on anything!
Join Date: May 2003
Location: Richardson, TX
Posts: 5,957
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I was suggesting the electric choke more so it will start in the mornings over mileage, but that is a good call too. I would bet in a heavy vehicle like a truck, it will probably rarely operate at 5600 RPM. The Edelbrocks are also pretty simple to tune as well.
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1974 Jimmy- 5.3/4L80e/NP241 |
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#10 |
Account Suspended
Join Date: Dec 2003
Location: Texas
Posts: 2,686
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Yea edelbrocks are kinda hard to beat
Holleys are good if you know how to tune them but alot of people tend to be scared of them They are great perfomers But IMO edelbrocks are the best for streetability. |
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#11 |
Registered User
Join Date: Nov 2003
Location: st. louis area
Posts: 1,551
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what max RPM do you intend to run it ?
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75 GMC C-15 short/step factory 454, lowered |
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#12 |
Silverado Stew
Join Date: Jan 2004
Location: Ewing, MO
Posts: 184
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I don't have a tach in my truck but if I had to guess I'd say it'd probably never run above 5K, but that's just a guess.
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- 1997 3/4 Ton Ext. Cab LB 4x4 6.5L Diesel - 1979 3/4 Ton Longbed 4x4 "Farm Truck" - 1984 1/2 Ton w/ '99 Vortec 350/700R4 2x4 FOR SALE |
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#13 |
Registered User
Join Date: Nov 2003
Location: st. louis area
Posts: 1,551
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Actually if itll never run past 5KRPMs a 570 Holley would be more than adequete & have great thorattle response. Buddy of mine has one one his 350 in a Suburban. works great. a 600 Edelbrock would be OK to if you prefer those. or a Qjet would be great to. John
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75 GMC C-15 short/step factory 454, lowered |
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#14 |
Registered User
Join Date: Feb 2003
Location: arizona
Posts: 61
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carter afb... am i the only one?
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#15 |
Silverado Stew
Join Date: Jan 2004
Location: Ewing, MO
Posts: 184
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- 1997 3/4 Ton Ext. Cab LB 4x4 6.5L Diesel - 1979 3/4 Ton Longbed 4x4 "Farm Truck" - 1984 1/2 Ton w/ '99 Vortec 350/700R4 2x4 FOR SALE |
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#16 |
Hoarding Rusty Objects
Join Date: Aug 2002
Location: Slatington, PA
Posts: 267
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Just in case you're interested;
http://cgi.ebay.com/ebaymotors/ws/eB...K%3AMESSE%3AIT I'd also say a 650 holley with vacuum secondaries. You could almost certainly get away with the 570cfm Holley Street Avenger.
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1985 Chevrolet K20 Silverado 1994 GMC Yukon Follow me on Youtube! - http://www.youtube.com/user/FuelInjectionSucks |
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#17 | |
Account Suspended
Join Date: Dec 2003
Location: Texas
Posts: 2,686
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Quote:
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#18 |
Slots go on anything!
Join Date: May 2003
Location: Richardson, TX
Posts: 5,957
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They only have the Carter in a manual choke configuration. If it doesn't bother you, that is the way to go. The electric choke conversion is 47.00 from Summit. I have the Carter on my 70 Camaro, and it won't start in this weather. A reman Edelbrock is $193 with the electric choke, while a manual choke is $183. A new Carter is $199.
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1974 Jimmy- 5.3/4L80e/NP241 |
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