Hello again...couple of questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

R@nger · 08-09-2005, 10:06 PM

Well I've had one busy summer and haven't been on this site for a while now. Its good to browse around again and it looks like I have alot of good topics I need to read.

When I was here last I was having troubles with my carb, well now its gone totally belly up. I'm almost positive the base is warped. I'm over that problem riddled quadrajet and I'm about ready to purchase a brand new carb for my truck. I do have a couple questions just to make sure I do everything 100% correct the first time so I don't have to run into trouble down the road.

First off I'd like to buy a Holley Street Avenger 670CFM carb. One thing I noticed on Summits website is when you click on the, "Check to make sure this part fits your application" I noticed it said the carb is not emissions legal??..I don't understand that because I thought several people on this board had that carb on their trucks. Whats emissions legal even mean?

Next question is I read that the carbs are jetted for sea level and that every 2000 ft. you go up you should go up one size jet. I do most of my driving at 4,000-4,500 ft. So I'm assuming I would need to go up at least 2 to 3 jets sizes. My question is what jet size are they at now??...I can't seem to find that info.

Also, What will I need to buy to make the kickdown switch for my TH350 trans work on the new carb?

My last question is that carb has dual fuel feeds so I'm guessing I would need a piece of pipe or hose that split into two lines right up by the carb..any recommendations? I would also like to run a braided fuel line(if this is feasible)up from the fuel pump to the split fuel line piece up by the carb. How much would this cost me and is it worth it? I'm looking for something flexible if at all possible.

Sorry for all the questions but I'm really trying to get this all figured out pretty quick as my Fall semester up at the college is quickly approaching. I'd like to get this finished before I start at the end of the month as I know things will start getting very busy for me.

I'm gonna try and call Summit tomorrow and get some questions answered but I want all the info I can get.

Any help would be awesome!

Thanks a bunch,

Kevin

P.S. Links to parts or info would help alot as well.

P.P.S. Somehow the vacuum pipe from my brake boost that attached to the back of my carb got bent real bad so now the brakes are real hard to use...any pre-bent pipe I can buy or possibly a braided flexible line of some sort. Thats gonna have to be fixed for sure.

cduster · 08-09-2005, 11:47 PM

Im not sure, but I thought you had to put smaller jets in for the elevation to lean the mixture. Not sure what size jet comes in them, but they are cheap and easy to change. You could get an assortment of them to find the best one for you. They make a special line for dual feed carbs.

Not much help, but hope it was a little!

Dan

R@nger · 08-10-2005, 12:14 AM

Ah yes, sorry I think I wrote that backwards. Hehe

Although I'm not sure if the...oh say number 1 jet is the smallest or the biggest.

**VetteVet** · 08-10-2005, 12:31 AM

Hi Ranger and welcome back.
I wouldn't change the jets until you see how it runs.
The term not emissions legal can mean anything from not meeting the emissions standards to not being original equipment. Unless you have testing You shouldn't have to worry about it.
you don't have a kickdown switch with a th350 but you need a mounting bracket for the cable. I assume that's what you meant. It mounts on the carb stud and you have to set it up so that the kickdown occurs where you want it to.
Summit sells the fuel line that you want. Also they have the dual feed line for the carb.
Good luck. VV

R@nger · 08-10-2005, 12:38 AM

Yeah I was talking about the stud on the throttle on the carb. My quadrajet had it when I got the truck but I figured the Holley wouldn't come with it.

68C15 · 08-10-2005, 07:53 AM

uh...you do have a manifold to fit the square bore Holley dont you? it wont fit a spread bore manifold & the adapters just plain SUCK.
about the jet #'s, if you tell me the LIST # of the holley I can tell you what they are along with the power valve size, primary shooter size etc.
may I suggest a Road Demon Jr.? they are about the same price & are much better.

R@nger · 08-10-2005, 03:31 PM

Ah...well minor detail there...lol. Thanks a ton for catching that 68C15! I wasn't thinging straight. The list number for the Holley carb is 0-80670

About the Road Demon Jr. suggest away I'm open for anything. Are they easily adjusted? After dealing with that quadjet I'm in no mood to be tuning and retuning and then tuning some more on the carb. Thats the reason I wanted to go with the Street Avenger, I've heard they are really nice to work with.

EDIT: I've been looking at carbs today and it appears if I want a newer carb, street avenger or Road Demon I'm going to have to put a new square bore intake manifold on there. If you could give me a part number from Summit on a good intake manifold and possibly that Road Demon Jr. carb you were talking about that would be awesome.

R@nger · 08-10-2005, 09:35 PM

Been looking at this manifold EDL-27012...any comments?

Also alot of those Demon carbs show up as N/A on Summit's website. Heres the only one I could find in my pricerange and the right CFM GPT-1282010

08-09-2005, 10:06 PM	#1
R@nger Psalm 23 Join Date: Apr 2005 Location: Utah Posts: 360	Hello again...couple of questions Well I've had one busy summer and haven't been on this site for a while now. Its good to browse around again and it looks like I have alot of good topics I need to read. When I was here last I was having troubles with my carb, well now its gone totally belly up. I'm almost positive the base is warped. I'm over that problem riddled quadrajet and I'm about ready to purchase a brand new carb for my truck. I do have a couple questions just to make sure I do everything 100% correct the first time so I don't have to run into trouble down the road. First off I'd like to buy a Holley Street Avenger 670CFM carb. One thing I noticed on Summits website is when you click on the, "Check to make sure this part fits your application" I noticed it said the carb is not emissions legal??..I don't understand that because I thought several people on this board had that carb on their trucks. Whats emissions legal even mean? Next question is I read that the carbs are jetted for sea level and that every 2000 ft. you go up you should go up one size jet. I do most of my driving at 4,000-4,500 ft. So I'm assuming I would need to go up at least 2 to 3 jets sizes. My question is what jet size are they at now??...I can't seem to find that info. Also, What will I need to buy to make the kickdown switch for my TH350 trans work on the new carb? My last question is that carb has dual fuel feeds so I'm guessing I would need a piece of pipe or hose that split into two lines right up by the carb..any recommendations? I would also like to run a braided fuel line(if this is feasible)up from the fuel pump to the split fuel line piece up by the carb. How much would this cost me and is it worth it? I'm looking for something flexible if at all possible. Sorry for all the questions but I'm really trying to get this all figured out pretty quick as my Fall semester up at the college is quickly approaching. I'd like to get this finished before I start at the end of the month as I know things will start getting very busy for me. I'm gonna try and call Summit tomorrow and get some questions answered but I want all the info I can get. Any help would be awesome! Thanks a bunch, Kevin P.S. Links to parts or info would help alot as well. P.P.S. Somehow the vacuum pipe from my brake boost that attached to the back of my carb got bent real bad so now the brakes are real hard to use...any pre-bent pipe I can buy or possibly a braided flexible line of some sort. Thats gonna have to be fixed for sure. __________________ 71 GMC Fleetside C15(cab), 3/4 ton, 350, Holley Street Avenger 570cfm carb, TH350 trans, Leaf-springs, 2WD. "Peter are you sleeping on the job? No I have a bug in my eye and I'm trying to suffocate him." - Family Guy Last edited by R@nger; 08-09-2005 at 10:14 PM.

08-09-2005, 11:47 PM	#2
cduster Registered User Join Date: Oct 2002 Location: S.W. Michigan Posts: 403	Im not sure, but I thought you had to put smaller jets in for the elevation to lean the mixture. Not sure what size jet comes in them, but they are cheap and easy to change. You could get an assortment of them to find the best one for you. They make a special line for dual feed carbs. Not much help, but hope it was a little! Dan __________________ Good Judgment comes from experience. Most experience comes from bad judgment.

08-10-2005, 12:14 AM	#3
R@nger Psalm 23 Join Date: Apr 2005 Location: Utah Posts: 360	Ah yes, sorry I think I wrote that backwards. Hehe Although I'm not sure if the...oh say number 1 jet is the smallest or the biggest. __________________ 71 GMC Fleetside C15(cab), 3/4 ton, 350, Holley Street Avenger 570cfm carb, TH350 trans, Leaf-springs, 2WD. "Peter are you sleeping on the job? No I have a bug in my eye and I'm trying to suffocate him." - Family Guy Last edited by R@nger; 08-10-2005 at 12:19 AM.

08-10-2005, 12:31 AM	#4
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,717	Hi Ranger and welcome back. I wouldn't change the jets until you see how it runs. The term not emissions legal can mean anything from not meeting the emissions standards to not being original equipment. Unless you have testing You shouldn't have to worry about it. you don't have a kickdown switch with a th350 but you need a mounting bracket for the cable. I assume that's what you meant. It mounts on the carb stud and you have to set it up so that the kickdown occurs where you want it to. Summit sells the fuel line that you want. Also they have the dual feed line for the carb. Good luck. VV __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

08-10-2005, 12:38 AM	#5
R@nger Psalm 23 Join Date: Apr 2005 Location: Utah Posts: 360	Yeah I was talking about the stud on the throttle on the carb. My quadrajet had it when I got the truck but I figured the Holley wouldn't come with it. __________________ 71 GMC Fleetside C15(cab), 3/4 ton, 350, Holley Street Avenger 570cfm carb, TH350 trans, Leaf-springs, 2WD. "Peter are you sleeping on the job? No I have a bug in my eye and I'm trying to suffocate him." - Family Guy

08-10-2005, 07:53 AM	#6
68C15 blood type; Retumbo Join Date: Jan 2004 Location: next to my reloading bench Posts: 10,269	uh...you do have a manifold to fit the square bore Holley dont you? it wont fit a spread bore manifold & the adapters just plain SUCK. about the jet #'s, if you tell me the LIST # of the holley I can tell you what they are along with the power valve size, primary shooter size etc. may I suggest a Road Demon Jr.? they are about the same price & are much better. __________________ Man rule #77...if you own a 67 stepside with a caddy 472 you will never be in danger of loosing you man card

08-10-2005, 03:31 PM	#7
R@nger Psalm 23 Join Date: Apr 2005 Location: Utah Posts: 360	Ah...well minor detail there...lol. Thanks a ton for catching that 68C15! I wasn't thinging straight. The list number for the Holley carb is 0-80670 About the Road Demon Jr. suggest away I'm open for anything. Are they easily adjusted? After dealing with that quadjet I'm in no mood to be tuning and retuning and then tuning some more on the carb. Thats the reason I wanted to go with the Street Avenger, I've heard they are really nice to work with. EDIT: I've been looking at carbs today and it appears if I want a newer carb, street avenger or Road Demon I'm going to have to put a new square bore intake manifold on there. If you could give me a part number from Summit on a good intake manifold and possibly that Road Demon Jr. carb you were talking about that would be awesome. __________________ 71 GMC Fleetside C15(cab), 3/4 ton, 350, Holley Street Avenger 570cfm carb, TH350 trans, Leaf-springs, 2WD. "Peter are you sleeping on the job? No I have a bug in my eye and I'm trying to suffocate him." - Family Guy Last edited by R@nger; 08-10-2005 at 08:58 PM.

08-10-2005, 09:35 PM	#8
R@nger Psalm 23 Join Date: Apr 2005 Location: Utah Posts: 360	Been looking at this manifold EDL-27012...any comments? Also alot of those Demon carbs show up as N/A on Summit's website. Heres the only one I could find in my pricerange and the right CFM GPT-1282010 __________________ 71 GMC Fleetside C15(cab), 3/4 ton, 350, Holley Street Avenger 570cfm carb, TH350 trans, Leaf-springs, 2WD. "Peter are you sleeping on the job? No I have a bug in my eye and I'm trying to suffocate him." - Family Guy Last edited by R@nger; 08-10-2005 at 09:46 PM.



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