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L78 Holley Rebuild...
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The black survivor is back from the Mini-Nats and I decided to send the 4557 to the doctor (Mr. Vintage) https://www.yenko.net/ubbthreads/imag...mlins/cool.gif for a rebuild. I have never touched the carb in 8 years...it is the original dated unit. Still has the original fuel block, lines and bracket. The original owner installed some kind of "old school" bracket to help kick in the secondaries (I guess)...you can see the bracket and pin in the photos. With a little help from Mr. Jackson, it will be good to go for spring driving.....check out the photos.
wilma underhood before removal.. https://www.yenko.net/attachments/327995-tn_DSCN1048.JPG |
Re: L78 Holley Rebuild...
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...I finished the smog plumbing from the prior thread.
https://www.yenko.net/attachments/327998-tn_DSCN1049.JPG |
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..original choke setup...you can also see the fuel line bracket..it has a part number stamped on it...there is also a small design stamp in the brass fuel block..
https://www.yenko.net/attachments/328003-tn_DSCN1053.JPG |
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So that's it...pack it up tomorrow and send to Ohio.
wilma https://www.yenko.net/ubbthreads/imag...ins/3gears.gif |
Re: L78 Holley Rebuild...
Tom;
First off, thanks...as always. https://www.yenko.net/ubbthreads/imag...lins/beers.gif Secondly...dunno if you'd noticed, but the carb has the wrong primary float bowl on it, and it's missing the bowl vent assembly. https://www.yenko.net/ubbthreads/imag...lins/frown.gif Eric |
Re: L78 Holley Rebuild...
As requested...checked the metering blocks and they are the correct pieces.
rear-4519 front-6328 |
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Tom, car looks really good.. https://www.yenko.net/ubbthreads/imag...iggthumpup.gif https://www.yenko.net/ubbthreads/imag...iggthumpup.gif How did you do at the Mini Nats?? What is the production date of this (the black) car??
Did you add the return spring coming off the front of the throttle assembly and attaching to the engine lift bracket?? This looks like it may be part of the added bracket you were talking about that the previous owner installed to enhance the secondaries... Rich https://www.yenko.net/ubbthreads/imag...lins/beers.gif |
Re: L78 Holley Rebuild...
Thanks Rich!....not sure why they put that extra spring on....original setup uses small spring mounting to the rear. That spring is also there....I will see how things work once we get it back from Eric. Car was well received at the show...we got a Peoples Choice award. This show is kind of low key...folks just hanging out in the sunshine and having some fun. Cowl tag date on this vehicle is 12C...engine is 11/22. Spring arrived yesterday...time to get the children ready to play https://www.yenko.net/ubbthreads/imag...ns/burnout.gif
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Re: L78 Holley Rebuild...
Dual springs were common in the older days. Sometimes the idle did not come back to where it was set at. And also some of the guys liked a stiffer feeling on the accelerator. https://www.yenko.net/ubbthreads/imag...-I-Have-It.gif https://www.yenko.net/ubbthreads/imag...ins/3gears.gif
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Re: L78 Holley Rebuild...
Sammy, how stiff is your spring..?? https://www.yenko.net/ubbthreads/imag...ns/naughty.gif
wilma https://www.yenko.net/ubbthreads/imag...ins/3gears.gif |
Re: L78 Holley Rebuild...
Congrads on the Peoples Choice award Tom!!! https://www.yenko.net/ubbthreads/imag...ns/worship.gif One of these years I would like to make it to either the Mini Nats or the Nationals with my Nova...
I also noticed in the pictures that your green colored TCS plug wire that mounts to the switch on the passenger side head has a brown colored plug head on it. I was told that the brown colored plug heads started to surface on the mid to late seventy production cars and the earlier ones used a grey colored plug which is what the repro ones are colored. I had to get a repro one for my car because that portion of the wire was hacked off years ago by the previous owner. Luckily I still had the wiring and black colored plug head that plugs into the TCS solenoid on the intake. I found this coiled up in the wiring gutter... Just another one of those "tid bits" of information that 90% of the rest of the population could care less about https://www.yenko.net/ubbthreads/imag...s/rolleyes.gif except for us crazy, maticulous car guys!!! https://www.yenko.net/ubbthreads/imag...mlins/grin.gif Rich |
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Rich, you see "new" things on these "old" cars every time you work on them.....I've probably looked at that carb a hundred times and never noticed the incorrect float bowl https://www.yenko.net/ubbthreads/imag...mlins/hmmm.gif you just keep doin' and learnin'...I also noticed there's some orange paint overspray on the TCS plug.
wilma https://www.yenko.net/ubbthreads/imag...lins/beers.gif |
Re: L78 Holley Rebuild...
That was the first thing I noticed in your picture was te front bowl and vent missing. Maybe that is why they added that bracket thing when the bowl was swapped out.
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Re: L78 Holley Rebuild...
Well the patient is out of the operating room and on to physical therapy https://www.yenko.net/ubbthreads/imag...mlins/grin.gif....the carb doctor did a good job of finding all of my Holley's ailments...and it had a few!! It's amazing how many things can be messed with in 39 years https://www.yenko.net/ubbthreads/imag...mlins/hmmm.gif so with a little more TLC and some corrective surgery we will be as good as new https://www.yenko.net/ubbthreads/imag...lins/smile.gif..hope to have it back running by the weekend...pictures from the recovery room to follow https://www.yenko.net/ubbthreads/imag...ins/3gears.gif https://www.yenko.net/ubbthreads/imag...mlins/flag.gif
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Re: L78 Holley Rebuild...
[ QUOTE ]
Well the patient is out of the operating room and on to physical therapy https://www.yenko.net/ubbthreads/imag...mlins/grin.gif....the carb doctor did a good job of finding all of my Holley's ailments...and it had a few!! It's amazing how many things can be messed with in 39 years https://www.yenko.net/ubbthreads/imag...mlins/hmmm.gif so with a little more TLC and some corrective surgery we will be as good as new https://www.yenko.net/ubbthreads/imag...lins/smile.gif..hope to have it back running by the weekend...pictures from the recovery room to follow https://www.yenko.net/ubbthreads/imag...ins/3gears.gif https://www.yenko.net/ubbthreads/imag...mlins/flag.gif [/ QUOTE ] Now......"Maybe"......You'll have a car that "Run's" correctly and 'You" will maybe not be MIA........... https://www.yenko.net/ubbthreads/imag...iggthumpup.gif.......Eric "Rocks" https://www.yenko.net/ubbthreads/imag...ns/worship.gif Ken https://www.yenko.net/ubbthreads/imag...mlins/flag.gif |
Re: L78 Holley Rebuild...
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Well the patient is out of the operating room and on to physical therapy https://www.yenko.net/ubbthreads/imag...mlins/grin.gif....the carb doctor did a good job of finding all of my Holley's ailments...and it had a few!! It's amazing how many things can be messed with in 39 years https://www.yenko.net/ubbthreads/imag...mlins/hmmm.gif so with a little more TLC and some corrective surgery we will be as good as new https://www.yenko.net/ubbthreads/imag...lins/smile.gif..hope to have it back running by the weekend...pictures from the recovery room to follow https://www.yenko.net/ubbthreads/imag...ins/3gears.gif https://www.yenko.net/ubbthreads/imag...mlins/flag.gif [/ QUOTE ] Sounds good, can't wait to hear how good it runs. I drove my L78 car with non functioning secondaries for over a year. I don't have the money to put a correct carb on it so I kept running the 3310 750 that came on it and it has no choke and has been monkeyed around with. It's still a blast to drive but I can't imagine how much better it would be set up correctly! Good luck with the fresh rebuild. |
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Jeff, the matching numbers stuff is pricey...but you can make a good carb out of a regular street Holley. Why not have Eric rebuild your current unit or perhaps he has a better core to work with...you can't see those date codes from the driver's seat https://www.yenko.net/ubbthreads/imag...mlins/grin.gif https://www.yenko.net/ubbthreads/imag...ins/3gears.gif
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Re: L78 Holley Rebuild...
Greetings all;
Well, I had every intention of getting some pics posted up today, but I spent the better part of the day dealing with several uncooperative "patients", as Mr. Williams might say. Depending on how much I can get done tomorrow morning, I'll try to pop a couple of pics up sometime in the afternoon. Ken; Thank you. https://www.yenko.net/ubbthreads/imag...lins/beers.gif Jeff; I'd be happy to help you with your 3310 if you'd like, just say the word. Eric |
Re: L78 Holley Rebuild...
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I'd be happy to help you with your 3310 if you'd like, just say the word. [/ QUOTE ] Why? https://www.yenko.net/ubbthreads/imag...mlins/hmmm.gif He has a perfectly good 4557 for that car. https://www.yenko.net/ubbthreads/imag...lins/dunno.gif Get that baby on there and I'll buy your 3310. https://www.yenko.net/ubbthreads/imag...mlins/grin.gif |
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hey you guys can u help me i got a new project nova JUST GENRAL INFO LIKE WHAT IT WAS FACTORY I TRADED MY BOSS LADY CADDY FOR IT IT HAS A TAG ON FIRE WALL SAYS ST 69 WRN 11427 THERE IS A 53 53 BELOW THAT ON THE INSIDE IT HAS A PLATE WERE THE RADIO WAS ON MY OTHER NOVA HAS 12 BOLTS IN THE REAR COVER OF REAR END TRANNY WAS IN THE TRUNK HAS A TAG THAT IS STAMPED CY -69 ON THE DRIVERS SIDE OF TRANNY IT CAME WITH A BIG BLOCK ON A STAND SOPOSSED TO BE THE ORIGANAL MOTOR AND IT HAS GILLS ON THE SIDE LIKE A FISH tho motor has a casting number 3963512on the back driver side
head has acasting number of 3946074 alumunim has the factory intake its ulumunim and has funny lil snow flake casting on it does this help i hpoe its worth tho caddy i trade |
Re: L78 Holley Rebuild...
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OK; the carb is wrapped up and will be on its back to Mr. Williams tomorrow.
To highlight a few things during the rebuild process; First and foremost, the carb was suffering from a pretty bad case of fuel contamination. The filter on the left is the one out of the rear bowl on Toms carb, the one on the right is a new unit for comparisons sake. https://www.yenko.net/attachments/329349-1_Filters.jpg Yes, it is essentially plugged solid. The insides of the float bowl looked even worse. |
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Next issue was the Borg/Warner needle & seats that had been previously installed. These units are responsible for more junked float bowls than I can count. https://www.yenko.net/ubbthreads/images/graemlins/no.gif
The problem lies with the extra threads below the groove for the O-ring--if this type of needle & seat is threaded too deeply into the float bowl, it will cut threads into the boss where a normal Holley needle & seat seals with its O-ring, thereby ruining the bowl. https://www.yenko.net/attachments/329...le%26seats.jpg |
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Next up was the accellerator pump cover. Whoever rebuilt the carb previously must've lost the correct clutch-head screws that secure this particular style of cover, and they replaced them with conventional Fillister head screws.
https://www.yenko.net/attachments/329...Pump_Cover.jpg Tom reported that the pump cover had been leaking...I wonder why? https://www.yenko.net/ubbthreads/imag...mlins/hmmm.gif (please pardon the typo in the pic...I was in a hurry https://www.yenko.net/ubbthreads/imag...mlins/grin.gif ) |
Re: L78 Holley Rebuild...
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Toms carb was also equipped with an incorrect later-style primary float bowl, which also lacked the correct float bowl vent assembly this particular carb requires. To note; the later style bowls can not be converted to use a bowl vent lever as they lack the cast-in boss for the lever retainer.
Tom provided a correct early style primary bowl, but it wasn't set up for the bowl vent lever either. https://www.yenko.net/attachments/329352-4_BowlA.jpg |
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Voila...one primary bowl now equipped for a vent assembly.
https://www.yenko.net/attachments/329354-5_BowlB.jpg |
Re: L78 Holley Rebuild...
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Next thing was to correct the warp that was present on the metering block surfaces. If this step is skipped (and it often is), the carb can develop internal leaks that can cause all sorts of grief and aggrivation.
https://www.yenko.net/attachments/329...achinedPMB.jpg |
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The secondary side received the same treatment.
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The baseplate surface receives the same treatment as well
https://www.yenko.net/attachments/329...e_machined.jpg |
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The baseplate itself is also machined flat again on both sides instead of just the manifold side as many rebuilders do:
https://www.yenko.net/attachments/329...p_machined.jpg |
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The bottom:
https://www.yenko.net/attachments/329...m_machined.jpg Finally, the baseplate was bushed for the primary throttle shaft, as despite the fact that this is a low-mileage carb, the funky secondary mechanical conversion that was noted earlier must've caused some extra wear as it definitely needed to be bushed. |
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Finally, the carb was buttoned back up and all of the adjustments were baselined for re-installation.
https://www.yenko.net/attachments/329...completeDS.jpg Ain't much to look at when compared to the restored pics we're all so used to seeing, but this is what a 38-year-old carb looks like in its "natural state." |
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And lastly, the business side of the carb:
https://www.yenko.net/attachments/329...mpleteBASE.jpg And that wraps it up. The carb definitely had some issues from its previous rebuild, but it should be good to go for another 38 years now...as long as Tom gets that dirty fuel issue resolved, that is. https://www.yenko.net/ubbthreads/imag...mlins/grin.gif Hope y'all enjoyed. https://www.yenko.net/ubbthreads/imag...lins/beers.gif Eric |
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Just curious Eric... did Tom choose not to have the carb re-plated? I would have thought after all the machineing and new parts,it will run like brand new and it should look like brand new. https://www.yenko.net/ubbthreads/imag...lins/dunno.gif
Extreamly interesting thread by the way! https://www.yenko.net/ubbthreads/imag...iggthumpup.gif |
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