My delimma
Thread Starter
Safety Car
Joined: Oct 2005
Posts: 3,570
Likes: 1
From: Algonac Michigan
My delimma
I have rebuilt my engine and I need to have a carb I can trust to fire it right up. I currently have 3 carbs to pick from. The first is the carb that came off of the engine. It is a 750 Holley dual feed that was too big for the eng(350).and would wash all the oil off the cyl. walls. I had to take the cylinders .060 over to correct that problem. I also have a 750 Edelbrock 1407 squarebore that I bought from a member who assures me that it will run, But I feel that this carb is too big also. My third option is a Q-Jet I was given by a friend. It is a marine carb and although I feel that this is the carb that I will eventually use,it needs to be rebuilt. It also needs to be tuned for an automotive application. I don't want to have to turn the engine over and over to get it to start. Any suggestions???
Last edited by sly vette; Jul 8, 2006 at 11:42 AM.
Melting Slicks
Joined: Oct 2004
Posts: 2,662
Likes: 8
From: Knoxville Tennessee
I have had a lot of people tell me they have bolted on an Edelbrock Performer carb straight from the box, fired it up and never adjusted anything. Also that is the most reliable without have to adjust all the time.
Bernie
Bernie
Race Director
Joined: Mar 2006
Posts: 14,112
Likes: 28
From: Florida
Most people put far too big a carb on a street engine.
Check this calculator and google for more info.
http://www.4secondsflat.com/Carb_CFM_Calculator.html
If you want to use your carbs you must pay particular attention to leaning the idle and transition circuit to prevent cylinder washing. Most carbs are set too rich at idle.
Check this calculator and google for more info.
http://www.4secondsflat.com/Carb_CFM_Calculator.html
If you want to use your carbs you must pay particular attention to leaning the idle and transition circuit to prevent cylinder washing. Most carbs are set too rich at idle.
Drifting
Joined: Jan 2006
Posts: 1,944
Likes: 22
From: Yooperville MI
I was running a 750 double pumper, manual secondary with a Percy's adjustable jet block on the primary side and it ran very well once I had it set up, but...I wanted the convienience of the electric choke and a little better fuel mileage. So I changed to an Edelbrock performer AVS 650 having previous experience with this line of carbs. Very reliable, do not leak, will work out of the box, metering rod/jet changes are easy using a chart that comes with the carb. If you are not a serious hard core tuner and want a good performing carb that you can set and forget, the Edelbrock is what I recommend. 
Race Director
Joined: Sep 2004
Posts: 11,874
Likes: 263
From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
only use one that you know is working properly.......if yuo screw this up you can kiss your cam goodbye....can you borrow a friends? or conversely set up one of your carbs on a friends car and make sure its working properly?
Drifting
Joined: Jan 2006
Posts: 1,944
Likes: 22
From: Yooperville MI
Sly, This 650 is tuned for a 355 that I had in a recent Z28. It's ready to go and you only live a few miles from me. If you want to borrow it, let me know.
Last edited by crazywelder; Jul 9, 2006 at 12:46 AM.
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Thread Starter
Safety Car
Joined: Oct 2005
Posts: 3,570
Likes: 1
From: Algonac Michigan
I'm thinking that I will use the Edelbrock 1407 that I bought from a forum member. Even though I feel that it may be too big for everyday use,I feel that for break in with the elevated rpms it should suit my needs. I would like to find a engine to try it on first,so I know that I will fire the engine quickly.
By the way,how can I prime the carb so I have fuel in the bowls for fire up???
By the way,how can I prime the carb so I have fuel in the bowls for fire up???
Race Director
Joined: Mar 2006
Posts: 14,112
Likes: 28
From: Florida
Originally Posted by sly vette
I'm thinking that I will use the Edelbrock 1407 that I bought from a forum member. Even though I feel that it may be too big for everyday use,I feel that for break in with the elevated rpms it should suit my needs. I would like to find a engine to try it on first,so I know that I will fire the engine quickly.
By the way,how can I prime the carb so I have fuel in the bowls for fire up???
By the way,how can I prime the carb so I have fuel in the bowls for fire up???
Tech Contributor
Joined: Aug 1999
Posts: 15,124
Likes: 3,927
From: Connecticut, USA
Sly
I broke in my 72's rebuilt engine last week. I used a StreetAvenger out of the box. It fired right up and ran good, the headers were glowing but I had the same thing happen with a Lars tuned q-jet too.
Fill the bowl through the air horn, set the #1 cyl to TCD, back if off to 8* BTDC, set the points to open. Prime the engine before installing the distributor until you get oil pressure and have oil coming out the push rods.
Use Rotella and EOS oils and it should fire up. I ran it at 2-2300 RPM for 30 minutes watching the temp, oil psi, timing.
I broke in my 72's rebuilt engine last week. I used a StreetAvenger out of the box. It fired right up and ran good, the headers were glowing but I had the same thing happen with a Lars tuned q-jet too.
Fill the bowl through the air horn, set the #1 cyl to TCD, back if off to 8* BTDC, set the points to open. Prime the engine before installing the distributor until you get oil pressure and have oil coming out the push rods.
Use Rotella and EOS oils and it should fire up. I ran it at 2-2300 RPM for 30 minutes watching the temp, oil psi, timing.