LS5 1971 BB Q-Jet Question
Thread Starter
Drifting
Joined: Jun 2006
Posts: 1,327
Likes: 43
From: Vernon CT
LS5 1971 BB Q-Jet Question
Will this work on my 1971 LS-5 454 BB?
http://www.ebay.com/itm/ROCHESTER-QUADRAJET-CARBURETOR-CHEVROLET-454-CID-7-4-L-/370480302011?hash=item564258c7bb&vxp=mtr
I'm not savy to carbs and their different types of chokes...
http://www.ebay.com/itm/ROCHESTER-QUADRAJET-CARBURETOR-CHEVROLET-454-CID-7-4-L-/370480302011?hash=item564258c7bb&vxp=mtr
I'm not savy to carbs and their different types of chokes...
Melting Slicks
Joined: Apr 2007
Posts: 3,189
Likes: 111
From: Tolland CT
That one is set up with an electric choke, your 71 came a divorced choke.
You may be able to convert if you're not looking for originality. I don't know whether the electric choke can be removed, converted to the type your 71 came with.
I'd suggest finding out who rebuilt it. I've heard of some mass rebuilders who seem to be okay. I had a Q-Jet rebuilt by Holley once. Piece of junk, had to replace the main body, hacked badly, couldn't get a decent idle. Local shop told me they've seen another which couldn't be tuned.
You may be able to convert if you're not looking for originality. I don't know whether the electric choke can be removed, converted to the type your 71 came with.
I'd suggest finding out who rebuilt it. I've heard of some mass rebuilders who seem to be okay. I had a Q-Jet rebuilt by Holley once. Piece of junk, had to replace the main body, hacked badly, couldn't get a decent idle. Local shop told me they've seen another which couldn't be tuned.
Melting Slicks
Joined: Oct 2006
Posts: 2,417
Likes: 336
From: Texas
Le Mans Master
Joined: Jul 2006
Posts: 8,117
Likes: 104
From: charlotte north carolina
Absolute waste of money. It looks real pretty, but it will run like dirt. Read Lars' papers on re-manufactured carbs. If you have the original carb to your car, guard it like your first borne child. If you want your carb rebuilt, send it to a reputable shop like Cliff Ruggles.
Last edited by jnb5101; Sep 21, 2015 at 07:06 PM.
Thread Starter
Drifting
Joined: Jun 2006
Posts: 1,327
Likes: 43
From: Vernon CT
I am told the carb is not original to the car.
After the heli-coil insert and rebuilding it /shipping will cost almost $500 for what it needs.
I'm not sure it's worth paying that out for a not-original carb.
After the heli-coil insert and rebuilding it /shipping will cost almost $500 for what it needs.
I'm not sure it's worth paying that out for a not-original carb.
Le Mans Master
Joined: Jun 2006
Posts: 6,390
Likes: 1,225
From: Tampa Florida
Melting Slicks
Joined: Apr 2007
Posts: 3,189
Likes: 111
From: Tolland CT
$500 sounds a bit high but not outrageous. What's the breakdown of costs? I don't recall what the rebuild fee was from Cliff Ruggles. You need a helicoil which adds $45.
A true original may cost much more, getting hard to find.
Thread Starter
Drifting
Joined: Jun 2006
Posts: 1,327
Likes: 43
From: Vernon CT
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!
Michael S. Palmer
5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!
Joe Kucinski
7 Bolt-On Upgrades From Extreme Online Store to Level Up Your C6 Corvette
Pouria Savadkouei
Melting Slicks
Joined: Jun 2003
Posts: 2,802
Likes: 241
From: Niles, MI
Melting Slicks
Joined: Oct 2006
Posts: 2,417
Likes: 336
From: Texas
here is another option instead of ebay.... i have a jet perf quadrajet on my 79 L82. has performed flawlessly for years now... just fyi.
http://jetchip.com/shop/performance-...g-block-q-jet/
http://www.jegs.com/i/JET+Performanc...36003/10002/-1
https://www.smicarburetor.com/produc.../productID/853
http://jetchip.com/shop/performance-...g-block-q-jet/
http://www.jegs.com/i/JET+Performanc...36003/10002/-1
https://www.smicarburetor.com/produc.../productID/853
Last edited by speedreed8; Sep 22, 2015 at 09:15 AM.
Drifting
Joined: May 2012
Posts: 1,353
Likes: 44
From: Calgary Alberta
I wouldn't waste time and money on that eBay carb - often commercially rebuilt units are a mixed bag of parts, and when there are problems with them often they can't really be sorted out because of holes drilled all over and incorrectly paired air horns and bowls, etc.
If you don't like your current quadrajet, find a good core somewhere for $30 and have that rebuilt instead. You can usually identify a good core when you see it - the screws and castings show evidence of tampering pretty quickly.
If you don't like your current quadrajet, find a good core somewhere for $30 and have that rebuilt instead. You can usually identify a good core when you see it - the screws and castings show evidence of tampering pretty quickly.
Le Mans Master
Joined: Jul 2006
Posts: 8,117
Likes: 104
From: charlotte north carolina
The 7041208 would work well on your car even though it's designated as a "truck" carb. The original flow areas are 3.1062 at idle and 3.7699 (in thousands of inches) at WOT with BA rods in the secondary. Lars used to recommend a slightly leaner idle (2.9806 and 3.768 and CH rods (74 jets, 41 rods and CH secondary for BBs) and I have found that to be a very good combination on both my BBs. As posted, if your carb is beyond repair, buy an unmolested carb (never opened, good inlet threads and un-warped from over tightening of hold down bolts) and rebuild it yourself or have Cliff do it.
Thread Starter
Drifting
Joined: Jun 2006
Posts: 1,327
Likes: 43
From: Vernon CT
I have probably spent more than that after wasting time and money on a commercial rebuilt. I'd think you would want a carb which you can simply drop on and go.
$500 sounds a bit high but not outrageous. What's the breakdown of costs? I don't recall what the rebuild fee was from Cliff Ruggles. You need a helicoil which adds $45.
A true original may cost much more, getting hard to find.
$500 sounds a bit high but not outrageous. What's the breakdown of costs? I don't recall what the rebuild fee was from Cliff Ruggles. You need a helicoil which adds $45.
A true original may cost much more, getting hard to find.
$25 Rebuild kit from eBay (was told it was junk parts) (paid)
45 Helicoil insert (paid)
13 Shipping to insert Helicoil (paid)
406 Rebuild
15 Return shipping
= $504
Cliff has it now. The bad news came when he looked at it (after installing the helical) relaying a host of problems one of which 3 of the 4 plugs are leaking. He also mentioned the crappy rebuild kit and so many other things --my head was spinning. He said it was not set up for BB LS5...
Melting Slicks
Joined: Apr 2007
Posts: 3,189
Likes: 111
From: Tolland CT
Here's the price breakdown:
$25 Rebuild kit from eBay (was told it was junk parts) (paid)
45 Helicoil insert (paid)
13 Shipping to insert Helicoil (paid)
406 Rebuild
15 Return shipping
= $504
Cliff has it now. The bad news came when he looked at it (after installing the helical) relaying a host of problems one of which 3 of the 4 plugs are leaking. He also mentioned the crappy rebuild kit and so many other things --my head was spinning. He said it was not set up for BB LS5...
$25 Rebuild kit from eBay (was told it was junk parts) (paid)
45 Helicoil insert (paid)
13 Shipping to insert Helicoil (paid)
406 Rebuild
15 Return shipping
= $504
Cliff has it now. The bad news came when he looked at it (after installing the helical) relaying a host of problems one of which 3 of the 4 plugs are leaking. He also mentioned the crappy rebuild kit and so many other things --my head was spinning. He said it was not set up for BB LS5...
Melting Slicks
Joined: Jul 2009
Posts: 2,091
Likes: 40
If you can find the correct year carb and number for your corvette you'd be better off in the long run. I would start there . Seems like throwing money at a incorrect carb is a waste for a valuable car like yours.
I buy the correct core and start there., or the correct restored carb for your car. The correct carb is an asset for an original BB car .
Peace
I buy the correct core and start there., or the correct restored carb for your car. The correct carb is an asset for an original BB car .
Peace
Melting Slicks
Joined: Apr 2007
Posts: 3,189
Likes: 111
From: Tolland CT
If you can find the correct year carb and number for your corvette you'd be better off in the long run. I would start there . Seems like throwing money at a incorrect carb is a waste for a valuable car like yours.
I buy the correct core and start there., or the correct restored carb for your car. The correct carb is an asset for an original BB car .
Peace
I buy the correct core and start there., or the correct restored carb for your car. The correct carb is an asset for an original BB car .
Peace
Another possibility may be to repair an incorrect carb so he may drive the car. Locate a 'correct' carb, have it refurbished, then sell the incorrect carb or keep it for a spare. These Q-Jets are getting harder to find in good condition.
Le Mans Master
Joined: Apr 2001
Posts: 5,941
Likes: 281
From: Was New Orleans but swam to Baton Rouge LA
Cruise-In IX Veteran
Finding a qjet original for your car could be tough. Here is an example of a restored ls5 Quadrajet for a Muncie corvette. It is just under $1500.
http://m.ebay.com/itm/1971-Corvette-454-4-speed-Rochester-Quadrajet-carburetor-7041205-dtd-2190-/181759389370?nav=SEARCH
http://m.ebay.com/itm/1971-Corvette-454-4-speed-Rochester-Quadrajet-carburetor-7041205-dtd-2190-/181759389370?nav=SEARCH
Last edited by Sigforty; Sep 23, 2015 at 10:06 AM.
Thread Starter
Drifting
Joined: Jun 2006
Posts: 1,327
Likes: 43
From: Vernon CT
Finding a qjet original for your car could be tough. Here is an example of a restored ls5 Quadrajet for a Muncie corvette. It is just under $1500.
http://m.ebay.com/itm/1971-Corvette-...370?nav=SEARCH
http://m.ebay.com/itm/1971-Corvette-...370?nav=SEARCH
Melting Slicks
Joined: Apr 2007
Posts: 3,189
Likes: 111
From: Tolland CT
Here's the price breakdown:
$25 Rebuild kit from eBay (was told it was junk parts) (paid)
45 Helicoil insert (paid)
13 Shipping to insert Helicoil (paid)
406 Rebuild
15 Return shipping
= $504
Cliff has it now. The bad news came when he looked at it (after installing the helical) relaying a host of problems one of which 3 of the 4 plugs are leaking. He also mentioned the crappy rebuild kit and so many other things --my head was spinning. He said it was not set up for BB LS5...
$25 Rebuild kit from eBay (was told it was junk parts) (paid)
45 Helicoil insert (paid)
13 Shipping to insert Helicoil (paid)
406 Rebuild
15 Return shipping
= $504
Cliff has it now. The bad news came when he looked at it (after installing the helical) relaying a host of problems one of which 3 of the 4 plugs are leaking. He also mentioned the crappy rebuild kit and so many other things --my head was spinning. He said it was not set up for BB LS5...
Thread Starter
Drifting
Joined: Jun 2006
Posts: 1,327
Likes: 43
From: Vernon CT
Well, I got the carb back from Cliff and bolted it on. It still seems to idle rough and takes 5 starts to get it going from cold. It didn't do that before, (I didn't play with the carb settings only tried to set the idle.)
When revved it and I let off the peddle it drops down to 200 RPM and flutters with dying or dies. I just want a consistent idle at 7-800 RPM :toe tap:
I was hoping for a trouble free smooth idle for the money I paid. What am I doing wrong?
When revved it and I let off the peddle it drops down to 200 RPM and flutters with dying or dies. I just want a consistent idle at 7-800 RPM :toe tap:
I was hoping for a trouble free smooth idle for the money I paid. What am I doing wrong?