L78 Holley Rebuild...

[kwhizz]

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Well the patient is out of the operating room and on to physical therapy ....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 so with a little more TLC and some corrective surgery we will be as good as new ..hope to have it back running by the weekend...pictures from the recovery room to follow

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Now......"Maybe"......You'll have a car that "Run's" correctly and 'You" will maybe not be MIA........... .......Eric "Rocks"

Ken

[Jeff H]

[ QUOTE ]
Well the patient is out of the operating room and on to physical therapy ....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 so with a little more TLC and some corrective surgery we will be as good as new ..hope to have it back running by the weekend...pictures from the recovery room to follow

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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.

[WILMASBOYL78]

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

[VintageMusclecar]

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.

Jeff;

I'd be happy to help you with your 3310 if you'd like, just say the word.

Eric

[DarrenX33]

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I'd be happy to help you with your 3310 if you'd like, just say the word.

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Why? He has a perfectly good 4557 for that car. Get that baby on there and I'll buy your 3310.

[FRITO]

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

[VintageMusclecar]

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.



Yes, it is essentially plugged solid. The insides of the float bowl looked even worse.

[VintageMusclecar]

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.

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.

[VintageMusclecar]

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.



Tom reported that the pump cover had been leaking...I wonder why?

(please pardon the typo in the pic...I was in a hurry )

[VintageMusclecar]

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.