*Part 1* Rebuild of Holley Carburetor list# 4777-2 Complete Rebuild with Indept Passage Cleaning

Part 1 Holley Carburetor 650CFM Double Pumper list# 4777-2 Complete Rebuild with Indept Passage Cleaning

[@outdamudtv]

My 850 holley is not squinting out the front so I found your video. So I'm gone try to clean it myself. Very informative video

[@holleycarbshowtosadvice40y90]

Thank you

[@foghornleghorn8536]

Thank you for putting the effort into creating these videos, and sharing your years of accumulated knowledge. It's much appreciated.

[@holleycarbshowtosadvice40y90]

Thank you.

[@PerformanceRacingGroupGarage]

Your videos on the Holley carburetor has helped me a lot. Just getting back in to hot rods and I’m having issues with my 750 double pump being to rich and needing to lean it out. Thanks for sharing your knowledge. Lots of people don’t want to share info

[@holleycarbshowtosadvice40y90]

We can't take anything with us out of this world ,I was fortunate enough to work on everthing from carburetors and points and condenser to electronic feedback carburetors and electronic ignition , all the way through EEC 1,2,3,4 and 5 systems with fuel injection , plus all kinds of racing.I know I'm blessed , thanks for watching.

[@yachtsteve]

Excellent instructional video!!

[@holleycarbshowtosadvice40y90]

Thanks

[@danjamison1327]

Thanks for sharing your years of knowledge. I want to have a better understanding of the parts within the carb as well. Still a novice at this, but willing to learn.

[@holleycarbshowtosadvice40y90]

Thank you for watching.

[@truckroasters5131]

This was a great four part series. Thanks for the time put in and for sharing your knowledge of the internal workings, especially the explanation of the metering block. Part of the magic of owning an older car is being able to understand and work on it yourself, thanks to the generosity of people like you who can explain how it's done. A good weekend coming up rebuilding the 2 barrel on my F100 after watching this. Much appreciated!

[@holleycarbshowtosadvice40y90]

Thank you for watching.

[@tdbofamerica9464]

This video series was extremely helpful, thank you.

[@holleycarbshowtosadvice40y90]

Very welcome.

[@marcstlaurent3719]

Excellent explanation Randy

[@holleycarbshowtosadvice40y90]

Thank you.

[@staniakovou5080]

Great Holley 650 carb overhaul video , thanks!

[@holleycarbshowtosadvice40y90]

Thank you

[@darylmcconnaughey4324]

Fantastic videos

[@holleycarbshowtosadvice40y90]

Thanks.

[@g6et_wrx177]

Thank you for the great video it was immensely helpful.

[@holleycarbshowtosadvice40y90]

Glad to help

[@paulvarrieur976]

Very in depth discussion. If I were to criticize any part of the video, it would be that you talk a little fast. You know what you are explaining because you have years of experience working on carbs. Most people watching do not. Still, very thorough and informative.

[@holleycarbshowtosadvice40y90]

Thanks

[@theofficialblacksheepcompa748]

Thank you for this video sir!!

[@holleycarbshowtosadvice40y90]

You are very welcome.

[@TheSaxon25]

Thanks Dad 🍻🇺🇸

[@johnmilner7603]

Be careful when blowing the air bleeds from the backside. I blew one out and I spent an hour looking for it and found it under the front of my car. I reinstalled it by adding a bit of red loctite then, sliding the bleeder onto a packing slip wire then holding the bleeder I fed the wire into the hole then let go of the bleeder, lined it up, and tapped it in place using a brass punch larger in diameter than the bleeder until it was flush to the carb body. Use low air pressure here.

[@holleycarbshowtosadvice40y90]

Yes it is always best to use low air pressure when cleaning or checking a circuit. Thanks john.

[@goldysgarage189]

I'd like to just hang out in his shop with my mouth shut and just watch and listen....wait, that's what we are all doing here....Thanks man.

[@holleycarbshowtosadvice40y90]

So many times I just stood there not saying a word with the older guys listening trying to pick up information , I have always loved automotive engines , carburetors, transmissions . Anything to do with cars and racing, I guess I will die a gear head, I learned alot from the old timers . Take care my friend.

[@goldysgarage189]

@@holleycarbshowtosadvice40y90 Cheers brother - I'm older as well (60s) and really never became proficient with Holleys - I have a 650 dp I want to sing with good authority - its going onto a Ford 351 Cleveland that has been shoehorned into a 66 mustang Fastback.

[@jeffgarner3903]

My buddy acquired a 1968 Corvette over the summer. It came from Arizona, I'm in Idaho (about 2000 ft higher in elevation), has a transplanted 427 from 1969, an electric fuel pump and a Holley (List# 4296) 4150 850cfm. The previous owner is no longer with us. He did some club racing, and as well it seems that he did some dyno tuning done because he had a car show placard with power numbers and the main jets on both sides are staggered. When my friend first took delivery late in the summer if ran ok. I drove it once a couple a of months after he got it. Lots of hesitation. Its down at the moment due to fuel fouled spark plugs. I had my buddy order a TricKit. The primary bowl was leaking and I wanted to be sure everything else with the carb was okay due to all the unknows. Now my question is should I mess with the jets with a 2000 ft elevation difference, possible race tune, and an unknow camshaft and valvetrain. I'm fairly certain it died due too running rich and fouled plugs. I'm new to carburetors but excited to dive in. Thanks!

[@holleycarbshowtosadvice40y90]

Jeff sounds like it definitely needs a carb. Kit, if you have the jet numbers write me back and let know what they are and I'll try to get you close at your elevation. I know you got to be excited to drive around a 68 corvette with a 427, hey it don't get know better than that !!

[@jeffgarner3903]

Rex@@holleycarbshowtosadvice40y90 I don’t remember the source but I read somewhere that from the factory the main jets were staggered. Anywho, this is what I found and what I’m thinking. I’m at 2700 ft. Don’t go in the mountains often enough to worry ab out it but we’re looking at about 5000 ft. C is the choke side T for throttle Side Factory 78C/82T (Primary) 82C/80T (Secondary) Current 68C/72T (Primary) 76C/74T (Secondary) Possible Change 67C/71T (Primary) 75C/73T (Secondary)

[@jeffgarner3903]

It just occurred to me that you might need the power valve sizes. I was remembering the video where you were talking about going to larger main jets when blocking off power valves. Anywho, here they are: Primary 10.5 Secondary 6.5

[@holleycarbshowtosadvice40y90]

That carburetor did come stager jetted from the factory, I would drop down two jet sizes on each corner from the stock jetting and try that, usually 1 jet size smaller for 1700 to 2000 feet of elevation, run your primary power valve and you can run the secondary power too, or you can install a power valve block off plug and jet the secondaries up 8 sizes higher number,, it might be best to run the secondary power valve in this car.hope this helps

[@holleycarbshowtosadvice40y90]

Jeff when you received the car which Jets were in it from arizona?

[@williamapostolu5062]

Your videos have been great. Clear and educational. I have a pair of 4150s on a sbc with a holly 250 blower. Iam going through them and noticed the secondary air bleeds in the center (high speed?) appear to be closed on both carburators. These 650dps are 2 corner idle circuts carbs, does that something to do with it. Iam scratching my head here. Is this normal......

[@holleycarbshowtosadvice40y90]

I'm not a blower guy but it seems they wanted to richen the mixture in the secondaries as rpms increased. Don't know if your blower is over driven or under driven but it sounds like they blocked the hsabs to help a lean condition. Hope this helps

[@cascajohn66]

thx

[@holleycarbshowtosadvice40y90]

Thanks for watching.

[@mikeg66]

Really enjoy your videos and I am looking forward to part 2 of this series. I have a question my carb is overfueling like crazy. It is not an obvious cause. Mechanic has gone through it and jetted it down but it still soaks the plugs after a few minutes. He just wants to replace the carb. I have been watching a ton of videos to see what it could be and have a few ideas but I am no expert at all. Is there something I should really look at? This carb has be ok in the past and has been cleaned but something must have missed..any advice would be great thanks

[@holleycarbshowtosadvice40y90]

Mike I need more information , need to know more what's in your engine , cam , carb size , cylinder heads, is it loading up at idle , will your idle mixture adjust .

[@mikeg66]

@@holleycarbshowtosadvice40y90 hey thanks for the reply. We did figure it out had a bad gasket on the power valve..to thin. And floats were set to high as well. You videos helped find these. Thanks

[@BlueDuck211]

What should I focus on when cleaning on my proform 750. My car wont idle, continuously backfires when starting but will run at anything other then idle when giving gas. New gas in an old tank, very dirty fuel filter. I am assuming the carb is full of crud now?

[@holleycarbshowtosadvice40y90]

.sounds like may need complete overhaul , and filter and possibly clean fuel tank.

[@justdoinstuff]

My metering block on my 2 barrel is on so tight I can not get it off. The bowel gasket was super tight as well but it did come off. I have tried everything I can think to to get the metering block off. It seems like adhesive may have been used with the gasket. Any suggestions? Thanks.

[@holleycarbshowtosadvice40y90]

Jeff they can stick so tight its unreal, sometimes you can soak the carb in strong carb cleaner awhile and may help but I've had to drive a thin screw driver in the upper corner to break them loose, but it might damage it. If you have to do this make sure you use a thin screw driver. Good luck.

[@inscoredbz]

I was wondering, do you have enough parts to build me a Holley double pumper with the 750 main body and 850 throttle body and what it would cost. I need it for a 383 SBC.

[@holleycarbshowtosadvice40y90]

I'm not building any carbs right now, maybe in the future.

[@stephenkrause4528]

What part number is the rebuild kit for this

[@holleycarbshowtosadvice40y90]

Guys I'll be back in a week.

[@RudyKeron]

I had a tough time finding it, but 37-485 is for the 650cfm- 4777-2 carb

[@xzavierbanda8619]

Hello, at 11:53 accelerator pump nozzle the two screws you took out on top the Holley, what happens if I have one missing? I’m leaf green new to carburetors and I saw that myself was missing one the screws.

[@holleycarbshowtosadvice40y90]

If its a holley double pumper it definitely needs to be installed the screw the nozzle, and the counter weight check valve. Hope this helps.

[@xzavierbanda8619]

Thank you for the fast reply! yes it’s double pumper and the discharge nozzle isn’t there either… so I guess I need to order one thank you again!

[@Bob-Pye]

Hi 4777 -7 is this a good strip carb 650 on a 302 gt 40 heads getting out of efi and back to carb for the track

[@holleycarbshowtosadvice40y90]

Yes I think that's a good choice.

[@Bob-Pye]

@@holleycarbshowtosadvice40y90 thank you for reply your holley videos are awesome iam sure i have questions in the future

[@SHONTONGA06]

Could you explain the difference between a 4777-1, -2 and -3?

[@holleycarbshowtosadvice40y90]

Their just different revisions of the Holleys . 4777-2 has something revised from the 4777-1 it could be almost anything.

[@danielesilvaggi]

I have a 4779 750 is this video pretty much the same for the one I have? Hope so lol

[@holleycarbshowtosadvice40y90]

Absolutely

[@butchking154]

randy i rebuilt my 750 and when adj the air fuel it will not slow the eng down any help would be helpful

[@holleycarbshowtosadvice40y90]

Butch go to my video on Holley Carburetor tuning: Idle circuits mods for high duration camshafts. Make sure float level is correct and check boosters at idle for dripping fuel. If all is good then check out my video .

[@butchking154]

@@holleycarbshowtosadvice40y90 thank u my friend