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08-02-2004, 08:30 PM
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#1 |
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Tonawanda 454
Join Date: Mar 2004
Location: Liquid Sunshine State
Posts: 2,754
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carb swap questions
i have never done this before but as i am a hardware man i figure its not too hard to do, plus i work at Ace Hardware so i can get my parts cheap if i need them. i am ordering the new carb tonight and want to make sure its all i need and how hard it is to swap.
Currently have stock 350 with Rochester quad in my 76. So i am ordering 3 parts from Summitracing.com: 1) EDL-9913 Rebuilt 750 cfm Performer carb (new is 1411) 2) EDL-2697 Adapter plate for Edelbrock carb to Rochester quad intake 3) EDL-8135 Fuel line adapter kit since mine has the metal line with flare connection to carb. I am not looking for great performance, just a good carb that wont give me major problems like this Rochester has. As I've never done this before, one of my concerns is if the accelerator rod (from gas pedal) will connect up without problems to the new carb. Since i am getting the adapter plate (Edel carb to Roch intake) it should be a matter of taking off the 4 old bolts (looks like the 2 rear may be missing), disconnecting the fuel line and accelerator rod and vacuum hoses. Putting down the gasket, plate, gasket and new carb. Will i need 4 new short bolts to tighten down the plate to intake? Hopefully the carb will come with the long ones to tighten the carb to the plate. Everything else is a matter of hooking it back up and i didn't see any vacuum intake holes on the new carb so i hope that doesn't mess anything up. Let me know if i am missing anything... also if you know a reliable resource with some step by step instructions online with pictures, that would be a tremendous help.
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91 Chevy Suburban Tonawanda 454 R2500 - SOLD!!!  04 Dodge Durango 5.7L Hemi 2WD, 24K miles (as of July 2011) In the past 30 years about 90% of Fords are still on the road, the other 10% made it home. ------------------- |
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08-02-2004, 09:35 PM
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#2 |
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I'm back with 2nd truck!
Join Date: Feb 2002
Location: Texas
Posts: 3,774
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Sounds like you have everything you need but you might want to rethink the carb. The Edelbrock carb is great but on a basic 350 the 600cfm will be good. I have a warmed over 350 and the 600cfm does great on mine. You also might want to get a Carter tuning kit for the size carb you get. The tuning kit from Carter is better than the one from Edelbrock with more items (rods, jets, springs) but will interchange. If you don't have emissions where you live you can get away with alot of the vacuum lines gone with this swap. I just have the brake booster, PCV, and the HEI hooked up to mine. Everything else I eliminated. On the adapter plate you are getting it should come with the bolts to hold it down.
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1979 Chevrolet Bonanza Big10 "Tootsie Roll" 1985 Chevrolet Silverado (wife's) Member of the Southern Bowties Club "Don't underestimate how sexy a fat man who drinks to excess can be." Homer Simpson |
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08-02-2004, 09:49 PM
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#3 |
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Tonawanda 454
Join Date: Mar 2004
Location: Liquid Sunshine State
Posts: 2,754
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the reason im going with the 750 is i expect it to be a bit quicker on the road, better response time and also the rebuilt is $5 cheaper than the 600...
or will i just be sucking more gas with the 750? whats the pros and cons?
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91 Chevy Suburban Tonawanda 454 R2500 - SOLD!!! 04 Dodge Durango 5.7L Hemi 2WD, 24K miles (as of July 2011) In the past 30 years about 90% of Fords are still on the road, the other 10% made it home. ------------------- Last edited by screwballl; 08-02-2004 at 09:53 PM. |
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08-02-2004, 10:19 PM
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#4 |
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You get what you pay for
 
Join Date: Dec 1999
Location: Cherryville, NC
Posts: 4,798
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Sucking more gas running worse. Go with the 600.
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Mike 1985 Chevy C-10 |
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08-03-2004, 12:34 PM
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#5 |
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Tonawanda 454
Join Date: Mar 2004
Location: Liquid Sunshine State
Posts: 2,754
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ok i placed the order last night and i went ahead and got the 600cfm. I talked to another good friend of mine whose baby bottle was filled with motor oil and he confirmed what yall said.
I shoudl have the parts Thur or Fri
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91 Chevy Suburban Tonawanda 454 R2500 - SOLD!!! 04 Dodge Durango 5.7L Hemi 2WD, 24K miles (as of July 2011) In the past 30 years about 90% of Fords are still on the road, the other 10% made it home. ------------------- |
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08-03-2004, 01:43 PM
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#6 |
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You get what you pay for
Join Date: Dec 1999
Location: Cherryville, NC
Posts: 4,798
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What, you didn't believe us? Sort of hurts my feelings. :p
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08-03-2004, 11:43 PM
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#7 |
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Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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You will be happier with the 625 CFM carb (actual size), The 750 would give you an outstanding topend running condition, but would make a lousey driving condition for normal everyday driving. The 750 works great on a lighter vehicle, such as a Camaro or a Nova, but for a heavy truck you want to keep the airflow up to get more efficiency in the carb throat. The 625 will curb your upper end power slightly, but it works quite well otherwise. I have a 625 on a 383 stroker motor and previously had a 750 in it's place, I witnessed the pain of sloppy acceleration from the carb, also when we rebuilt the motor, the intake valves were coated with deposits, from the fuel. You can buy the Edelbrock internal parts cheaper than the Carter parts, since they are essentially the same "Weber" bodied carb. Play with the needles and jets to get the best acceleration and fuel ecomomy, it is worth it.
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08-04-2004, 08:08 PM
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#8 |
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Tonawanda 454
Join Date: Mar 2004
Location: Liquid Sunshine State
Posts: 2,754
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the fuel line adapter and intake adapter plate will be here the 6th and the carb the 10th even though it was one order, the carb is coming from CA.. so i hope that distance doesnt hurt it with all the bumping from shipment
the closest i could find locally was a 600 rebuilt for $550 plus the adapter plate for $120... no thx
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91 Chevy Suburban Tonawanda 454 R2500 - SOLD!!! 04 Dodge Durango 5.7L Hemi 2WD, 24K miles (as of July 2011) In the past 30 years about 90% of Fords are still on the road, the other 10% made it home. ------------------- |
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08-05-2004, 12:40 AM
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#9 |
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Registered User
Join Date: Apr 2004
Location: Bonney Lake, WA
Posts: 47
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i hope you didnt pay too much cus you can get a brand new 600 from shucks for 250 or off of ebay for <200
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08-05-2004, 09:52 AM
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#10 |
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Tonawanda 454
Join Date: Mar 2004
Location: Liquid Sunshine State
Posts: 2,754
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i got a warrantied rebuild 600 from summit parts for $229
__________________
91 Chevy Suburban Tonawanda 454 R2500 - SOLD!!! 04 Dodge Durango 5.7L Hemi 2WD, 24K miles (as of July 2011) In the past 30 years about 90% of Fords are still on the road, the other 10% made it home. ------------------- |
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08-10-2004, 08:30 PM
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#11 |
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Tonawanda 454
Join Date: Mar 2004
Location: Liquid Sunshine State
Posts: 2,754
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ok got it finally (it took 7 days from the ship date) and swapped out today since its my only day off work. took awhile since ive never done it before but it was successful. I got rid of most of the vacuum parts although im wondering if anything is suffering because the vacuum valve just above the fuel pump isn't attached to anything now.. if it wasnt for this damn rain i would still be out there.
The second thing is the gas pedal is half the distance it was from the floor now, i know it is because the line is pulled tighter due to the forward pump drive link... i was wondering if theres a way to fix this or just learn to live with a shorter pedal distance...
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91 Chevy Suburban Tonawanda 454 R2500 - SOLD!!! 04 Dodge Durango 5.7L Hemi 2WD, 24K miles (as of July 2011) In the past 30 years about 90% of Fords are still on the road, the other 10% made it home. ------------------- |
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08-10-2004, 09:25 PM
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#12 |
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DAMN, I love Big Blocks!
Join Date: Aug 2003
Location: New Mexico, USA
Posts: 619
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Also, you didn't need the adapter plate. The Edelbrock performer carbs are drilled with both squarebore and spreadbore patterns. Just use a Rochester Quadrajet gasket and use the inner bolt holes. I've done it a few times with success. If you were dealing with an "ultimate performance" engine, a disruption may be created by the somewhat poor transition between the squarebore carb and the spreadbore manifold, but in a realitively stock engine, it wouldn't make much difference. At least it doesn't with aftermarket spreadbore manifolds.
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Marc Bona Hobbs, New Mexico 1976 1/2 ton GMC High Sierra. 454 c.i.d./ TH400. *Soon to get a mild warming over.* 3.40 rear. 
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08-11-2004, 09:21 AM
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#13 |
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Tonawanda 454
Join Date: Mar 2004
Location: Liquid Sunshine State
Posts: 2,754
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oh well its already on there and i would prefer the adapter plate for proper airflow...
I'd still like to know if theres a simple way to get the gas pedal back in the original location.
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91 Chevy Suburban Tonawanda 454 R2500 - SOLD!!! 04 Dodge Durango 5.7L Hemi 2WD, 24K miles (as of July 2011) In the past 30 years about 90% of Fords are still on the road, the other 10% made it home. ------------------- |
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08-12-2004, 10:01 AM
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#14 |
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Tonawanda 454
Join Date: Mar 2004
Location: Liquid Sunshine State
Posts: 2,754
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doh nevermind i found a throttle cable extension kit that will take care of my problem. (Edelbrock #8012)
__________________
91 Chevy Suburban Tonawanda 454 R2500 - SOLD!!! 04 Dodge Durango 5.7L Hemi 2WD, 24K miles (as of July 2011) In the past 30 years about 90% of Fords are still on the road, the other 10% made it home. ------------------- |
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08-12-2004, 11:22 AM
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#15 |
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Registered User
Join Date: Mar 2003
Location: San Antonio, TX
Posts: 441
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I have the 750 AND the 600. the 600 is good on the 350, but the 750(i had to change the rods a tad leaner for cruise, 2 stages richer on primary jets, and 8 leaner on secondary jets, as well as lighter vacuum springs), it idles well, part throttle and cruises well, and WOT is W00T! But if you want a good all-around you won't really have to mess with, go with the 600. btw, did I mention I lightened the secondary butterfly too?
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08-12-2004, 11:53 AM
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#16 |
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Senior Member
 Join Date: Feb 2004
Location: White Hall, AR
Posts: 316
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I've been thinking about rebuilding the q-jet on my stock 76 Sierra Classic 350. Would it be better to go to the 600 cfm Edelbrock? If so, what is the part number for the one you guys would recommend?
Thanks, Mike |
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08-12-2004, 04:51 PM
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#17 |
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Registered User
Join Date: Jul 2001
Location: Atlanta GA
Posts: 1,704
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Personnaly I would stick with the Quad. $14 for a rebuild kit. Might need to have a machine shop sleeve the shafts. As long as sombody didnt; mess with it allready and overtighten stuff and warp the casting why change?
Stock q-jet will hadle 750 if you can build the motor to do it but if you motor only needs 500 then it will only provide 500. That's the great thing about them. They adjust to engine demand. I got Rochesters on three right now and the new one is still 20 years old. If I'm driving the truck daily it starts first try. It starts better then my Fuel injected Suburban.
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Grim-Reaper 70 Pontiac LeMans Sport Convertible, worlds longest resto in progress Looking for 71-72 2wd Blazer or Jimmy Project |
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08-12-2004, 04:52 PM
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#18 | |
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Senior Member
Join Date: Feb 2004
Location: White Hall, AR
Posts: 316
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Quote:
Mike
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08-13-2004, 09:46 AM
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#19 |
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Tonawanda 454
Join Date: Mar 2004
Location: Liquid Sunshine State
Posts: 2,754
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after going to the Edelbrock 600cfm (part #1400 available from www.summitracing.com ) i will never go back to a Q-jet. yes my truck would start first time everytime... unless the engine was warm, then it would take 10 minutes to never to start. Thats why i needed to replace it, as soon as the engine was warm, if i shut it off, came back to try to start it 30 mins or 4 hours later, 95% of the time it would NOT start.
I got this Edelbrock with adapterplate for Q-jet intake, i have close to twice the power, speed and response that i did before with the Qjet. It is quick of the start and quick to respond in traffic. I have Michelin 31x10.50 XTC tires (made for off road) and it spins them on dry pavement. Never did that before with old carb, had to be wet before those tires spun. My personal suggestion based on what 95% of what everyone else has said, definately go with at least the Edelbrock carb. If you want part numbers for summitracing.com let me know and i will give them to you. It cost me about $310 for carb, adapter plate and chrome aircleaner/filter. I did it myself and have NEVER done any engine repair myself before and it was easy enough for me. To have someone do it locally, it would have been $600 for the same parts plus labor.
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91 Chevy Suburban Tonawanda 454 R2500 - SOLD!!! 04 Dodge Durango 5.7L Hemi 2WD, 24K miles (as of July 2011) In the past 30 years about 90% of Fords are still on the road, the other 10% made it home. ------------------- |
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08-17-2004, 05:01 PM
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#20 |
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Registered User
Join Date: Aug 2004
Location: Milwaukee, WI
Posts: 5
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Hey screwball,
What did you do about the fuel filter? Isn't is different on the #1400 than on the Q-Jet (attached to the carb)? |
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08-17-2004, 05:44 PM
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#21 | |
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Registered User
Join Date: Jul 2001
Location: Atlanta GA
Posts: 1,704
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Quote:
Kewl $300 + for a Edlebrock to solve a choke problem that may have cost nothing to repair. 
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Grim-Reaper 70 Pontiac LeMans Sport Convertible, worlds longest resto in progress Looking for 71-72 2wd Blazer or Jimmy Project |
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08-17-2004, 11:18 PM
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#22 |
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Registered User
Join Date: Aug 2004
Location: Milwaukee, WI
Posts: 5
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What kind of choke problem?
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08-17-2004, 11:41 PM
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#23 |
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95 extended cab sportside
Join Date: Jul 2004
Location: Clinton, Iowa western.
Posts: 895
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the 750 is not worth it. i would go with the 600. i get great get up and go with it. you are jsut sucking like double gas other wise.
just my cent thanks shane
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  95 Chevy k 1500 00 Chevy Silverado 1500 07 cobalt Old ladies car]
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08-18-2004, 09:35 AM
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#24 | ||
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Tonawanda 454
Join Date: Mar 2004
Location: Liquid Sunshine State
Posts: 2,754
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Quote:
Quote:
Alpha, I already have it, its been installed for over a week now and is doing awesome!!! thnaks for the help everyone!
__________________
91 Chevy Suburban Tonawanda 454 R2500 - SOLD!!! 04 Dodge Durango 5.7L Hemi 2WD, 24K miles (as of July 2011) In the past 30 years about 90% of Fords are still on the road, the other 10% made it home. ------------------- |
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08-18-2004, 11:50 AM
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#25 |
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Registered User
Join Date: Aug 2004
Location: Milwaukee, WI
Posts: 5
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O.k., I have a Q-Jet #17085290 in my 1986 GMC K2500 pickup. I sent an e-mail to Edelbrock and they are telling me that my carb is computer controlled and Edelbrock doesn't make a replacement Q-Jet for that type of carb. I asked because I couldn't find my carb on their cross-reference sheet.
Will the #1400 work on my truck? I'd like to go with the 600cfm. My baby needs a new carb NOW and I'm at a loss. Your help is greatly appreciated! |
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