Review, features, and a Warning! Holley 950 Ultra XP carburetor

This vid started as a review and to show off the features of my brand new Holley ultra xp 950 cfm carburetor but when I dove into it I found a problem! This carb will be on my stroker small block mopar in my 1968 dodge dart drag car.

[@SimpsonsSpeedShop]

Check out Andy for more tuning kzbin.info

[@UnityMotorSportsGarage]

Thanks Brother! Great Video... I would say I'm shocked seeing that brass inside.. but I have had my fair share of new parts fail...just had a new Milodon oil pan leak on one of the welds .. Great video I can't wait to see your engine run.. you have put alot of blood sweat and tears into it! It's going to be Epic! Just hit me up when the time comes..

[@SimpsonsSpeedShop]

@@UnityMotorSportsGarage right on bro ya I saw your pan leak 😢 Milodon will send a new one I’m sure amd ohhhh ya you’ll know when I’m on the dyno !

[@randysmith9636]

Man I really like that Carb. You mentioned, back in the day. When I was a weekend warrior I was lucky enough to have my carb worked over by a old team mechanic from the Motown Missile Pro Stock car. That new carb is light years ahead of what we ran in the late 70s early 80s. Thanks again for another great video. I am so looking forward to hearing her run. It's going to be a great year.

[@SimpsonsSpeedShop]

Yes nice unit after a cleaning lol. So many features glad to see carb tech is still evolving. Thanks for watching

[@olsketchmo]

Anything at all inside brand new out-of-the-box $1,000 ! carburetor passages, let alone brass filings, it totally unacceptable imho... I don't know what world it is I live in anymore... cause it sure ain't the one it was... or that I was taught it was supposed to be...

[@randysmith9636]

Good morning brother from mid Tn. I hope everyone is having a great day.

[@ricardoguerrerojr80]

Watching your channel has been a god send on helping me with my 68 dodge dart gt thanks for all the tips ...I wish you was in north Carolina I could use some help and some advice with mine...keep the video coming I could use all the help I can get

[@SimpsonsSpeedShop]

Dude so glad to hear! Thanks for watching amd good luck with your project feel free to ask any questions you may have I’ll answer as best I can. 👍🏻

[@Impactjunky]

@ricardo guerrero jr I live in NC and I'm pretty well known for my strong running Magnum swapped 68 satellite. I do paint and body work but I'm also good with carbs and old school engine tuning in general. I've helped quite a few people get their old carbureted project cars running good. If you have any issues or questions feel free to ask me any time.

[@ricardoguerrerojr80]

@@Impactjunky what part of nc

[@Impactjunky]

@@ricardoguerrerojr80 Durham/Chapel Hill/Orange county area

[@4ondflor]

Great catch on the debris. I wanted one of these but cash was tight so I tried the brawler 850 instead. So far it’s been good to me, I’m really happy with it. I wanted to try a double pump as my original was a 770 vac sec.

[@JustMoparJoe]

Very well done! That’s the best carb review I’ve seen in a while! Thanks for sharing brother

[@SimpsonsSpeedShop]

Hahha right on thanks bro.

[@edsmachine93]

Joe the carb looks like,"Industrial Performance". I had not seen one like that. First class. Great content. Thanks for sharing, EM.

[@Cravz69]

Excellent review, I have the 850 CFM. I drilled and tapped my 1 inch aluminum spacer to provide vacuum for my brakes and transmission.

[@mattsecuro2968]

I love it joe , keep up the great work alot of mopar guys watch you

[@SimpsonsSpeedShop]

Right on bro thanks for watching. I’ll keep the content coming!

[@stephenjoy5021]

Looks like a good carb.i run a 995cfm carb built by pro systems.They build a helluva carb!

[@darrellhitchens426]

Very informative Joe, I’m a Chevy guy but love all the classics and carbs are carbs whether they’re feeding a rat or a hemi. Looking forward to the coming car show and drag season here on the island and the mainland. Keep up the good work!

[@SimpsonsSpeedShop]

Right on man. I love them all too! Thanks for watching 👍🏻🇨🇦

[@ninjapumkin]

Running a Quickfuel 850 and bought a new 950. Built basically the same but at 20% less the cost. Just as tuneable

[@SimpsonsSpeedShop]

The quick fuel model that rivals this one is the same price or a bit more

[@rodneybyrd9516]

Holley bought Barry Grant (Demon Carbs) and they had the patent on that "Idle-Eze" feature with the bypass adjustment under the air filter stud. Nice to see them in the Ultra-HP series!!

[@SimpsonsSpeedShop]

👍🏻 really nice. Thanks for watching

[@olsketchmo]

@Rodney Byrd Holley Had the "Idle Eze" feature in 1959 on the Holley List 1971 4-Barrel Carburetor used oem on the 1960 model year Dodge 383 motor as seen in this 1960 Chrysler Video Training Film... kzbin.info/www/bejne/sJvMm2p3rsx7aas

[@vrm86gt]

looks like a nice carb, glad you checked it over first and found the debris!

[@imken2392]

I've been preaching transfer port sync for years. With the blades closed the transfer port should look as wide as it is long...it should look like a square rather than a rectangle...maybe a bit rectangular. I think the last one I set up ended up at .040 long. The front too far past square and you will be into the transfer slot emulsion jets in the metering block. I've got several carbs here with holes drilled in the plates sitting on the shelf, the idle air adjustment now offered is excellent.

[@SimpsonsSpeedShop]

Totally. They should do it on all the ho models at least. Nice feature

[@brianreynoldson1965]

It's nice too see that Holley has been paying attention to what was/is occuring in modern motorsports. Back in the day, you had to invest in pin drills to modify the idle and secondary circuits. What wasn't nice was the obvious lack of quality control by Holley. Definitely fire off an email to express your concern of the lack of QC, especially since your paying that kind of cash for a "competition only" carb.

[@SimpsonsSpeedShop]

Yes your right. Thanks for watching

[@devillockj]

I chuckled about the brass shavings. I bought a 750 mighty demon nearly 20 years ago and the vent tubes were full of metal shavings. Always disassemble and check this aftermarket stuff regardless of price or brand.

[@SimpsonsSpeedShop]

This is true. But price and brand should matter. Over all I like the carb just trying to show people about quality problems thanks for watching

[@jimc3688]

Had a similar issue back in those days. Would not idle and adjust properly. Turns out one port was not drilled. Had to remove a plug and drill it out.

[@mworke]

A thousand dollars with brass shavings/debris in the metering blocks? Holley's quality is in the toilet. They are living on their past reputation and don't care of what they sell is garbage as people have been conditioned to accept it. I'd sent it right back on their dime and request a replacement.

[@SimpsonsSpeedShop]

@@mworke your not wrong. But I cleaned it out in like 2 mins with a q tip so not worth waiting weeks for them to send a new one.

[@SteveP-vm1uc]

Brother, you should work for HOLLEY!!!! Very nice job on all the info...

[@SimpsonsSpeedShop]

Glad you like it, thanks for watching bro!

[@tedslife7086]

I took mine off I had a 800 CFM I put on now a Edlebrock with vacuum advance

[@ChuckSSoul]

Yea,,, I would take pictures of it send it to Holley for their quality control to document

[@brianboleac511]

I've noticed that holley's QC has really been lacking in the last few years. I have found major quality issues on 3/3 new holley carbs so far. I am now trying to stay away from the holley brand. It's really a shame, buying a holley product used to mean something but now it comes with a warning.

[@SimpsonsSpeedShop]

Yes it is too bad. Once I cleaned this up I am very happy with tho. The dyno will tell the real story. Thanks for watching

[@peskypeet]

It's been bad for years!

[@brianboleac511]

@@SimpsonsSpeedShop keep up the good work 👍 I look forward to the dyno video. I'm over on the mainland in langley BC with a 67 mustang and am getting into racing myself

[@SimpsonsSpeedShop]

@@brianboleac511 right on! Sounds like a sweet project maybe I’ll see you at mission sometime 👍🏻🇨🇦

[@brianboleac511]

@@SimpsonsSpeedShop that would be sweet!

[@duanedahl8856]

First thing I did with my Holley XP was to take it to a carb pro, and go through it and tailor it to my setup, and yes Holley QC is horrible these days, sux to spend 1k and have to dismantle it right out of the gate. Probably would be best to go Thumper or AED if I was looking for a carb today

[@SimpsonsSpeedShop]

Yea now she cleaned out and rest to roll still a nice unit. Just need a cleaning thanks for watching

[@dougpendleton1266]

I was having a hesitation issue with my new 750 HP double pumper. Come to fine out, Holley had installed the primary fuel squirt nozzles in the secondaries and vice versa. Once I found that and swapped them, the hesitation was gone. Very disturbing QC.

[@mjj6870]

That new carburetor should help a lot, love it

[@SimpsonsSpeedShop]

Ohhh yea 👍🏻👍🏻👍🏻

[@buff6637]

Good Stuff Joe! Can't wait to see the new motor in action! 🙏☮

[@SimpsonsSpeedShop]

Hell ya brother. Thanks for watching short block coming soon 😅

[@walasiewicz]

That is a killer looking carb

[@SimpsonsSpeedShop]

It is very nice looking! Stay tuned to see it o bc the dyno soon!

[@Turningwrenchs]

AED just did me a set of G5 verynice if you like the gasket s that are reuseable AED was first .

[@Steve69SS396]

Just started watching your video's. Love the car! If I was you I would run a transbrake or drop the launch RPM. I have a '69 Camaro that I foot brake and it has always run faster by staging at a low RPM and letting the converter flash on the launch. Looks at your own video's you will see that the suspension on your car is done when you footbrake it at 4,500. The suspension has already reacted to the launch and it has nowhere to go. So far my car has run 9.50's at 143 with a smallblock. It has the power to run in the 8's but It didn't have enough gear until now. Best short times have been 1.38-1.36 off the footbrake.

[@SimpsonsSpeedShop]

Ya I have tried flashing converter before but still always got the best times out of footbraking up at 45. But transbrake went into trans a couple videos ago! Lol so should be good for this year. Thanks for watching!

[@tedslife7086]

I got Edlebrock 800 on a 496 stroker running 60 over 10:1 and seems way to small on the carb ...I need one of these 950

[@harleybell479]

Awsome as always mopar brother . I live in northern b.c hope to meet ys one day. If you every go to mission who knows might see u there.

[@SimpsonsSpeedShop]

Right on bro 🇨🇦 i do want to head to mission maybe this year or next. You’ll know about it when I do! Thanks for watching

[@Foxtrot1967]

EFI is great but nothing is sexier that a tall single-plane with spacer and carb!

[@MrLangleylad]

That’s crazy ! How can that happen ? Holley would be getting an earful from me ! . Great video 👍

[@SimpsonsSpeedShop]

Thanks for watching 👍🏻

[@peskypeet]

The higher ups at Holley don't care. They just want you to send it back where you got if from and get an exchange.

[@bradytallred]

I’m so glad I found this channel! I’m currently building a forged bottom end 360 with solid lifter cam, high rise intake, roller rockers, and 2.02 heads. I just cannot sleep at night for trying to decide what carb size to use? What was your previous carb (and cfm)? I feel like 650 might be too small. Your new stroker is my dream engine and I’m already planning that build!

[@SimpsonsSpeedShop]

I ran a 750, check out my 360 dyno vid!

[@bradytallred]

@@SimpsonsSpeedShop sure thing and thanks! Keep up the great videos!

[@yarrdayarrdayarrda]

Oh, may as well order a set of 4 of .027" and .037" high speed bleeds, I swap them all the time on the dyno as an easy tuning tweak.

[@peskypeet]

I hope you removed all those drilled bleeds and ran compressed air through there. I don't think a simple surface cleaning with a Q tip is going to cut it my friend.

[@SimpsonsSpeedShop]

That’s a good call, thanks 👍🏻

[@ScottsSpeedShop]

Those are beautiful carbs, but it is an absolute shame, if Holley doesn't take care of you, let me know. I can get it sorted out for you

[@SimpsonsSpeedShop]

It’s all good man. I cleaned them out with a q tip just took a few minutes. Just glad I took them apart first. Still happy with carb letting this serve as a warning to new carb buyers

[@mikestackhouse9001]

Joe, please explain the eight brass vents a little more. Are they all the same size? Would you change them if your barometric pressure raises or drops or doesn't that matter? Thanks for sharing this video. Things are going to get interesting!

[@SimpsonsSpeedShop]

These are the emulsion jets, older style Holley used tubes and was not tune able I believe. This will help tune in AFR better in different rpm range to fix certain parts of the curve. But like I said I haven’t played with them before so it’s new to me too. Must be done with a wideband tho. Thanks for watching

[@yarrdayarrdayarrda]

We've sold a boatload of that exact carb, pretty much unbeatable on the dyno as 4150 carbs go.

[@c10burnout93]

Mine was the same way with the brass inside but also the base plate was loose and leaking

[@SimpsonsSpeedShop]

😬

[@the4flatgarage]

The people who do the wet-testing, do some weird crap. Like, dropping wrenches, resulting in a marred spot where ever the wrench landed. Mine was right where the fuel line attached to the bowl. It leaked. Upon further inspection, found the mar, massaged it until smooth, and reattached it...no leak. It just seems that products cannot get through QC without an issue. You know that guy had to have had a leak as well. Must have been a Friday.

[@SimpsonsSpeedShop]

Friday shift lol. Ya quality is an issiue. After it’s cleaned up it’s a nice unit. Still happy with the it thanks for watching

[@approachingtarget.4503]

Would it be nice if you ordered the carb and it came specifically tuned for your combo. All kinds of adjustment trinkets that only a carb builder can test and adjust.

[@SimpsonsSpeedShop]

That’s not true. Only a dyno can tune it to your combo. We will dyno tune the carb with new motor and I run a wideband to tune it to the street after that. Thanks for watching

[@mikesr3407]

Watching you talk about carbs reminds me , I no nothing ! Lol o g here who time and tech passed up while digging holes for a living ! I turn the key on my 650 kawi and fuel injection does the rest ( so mindless ) but I Don't want that on my Dart, any technical books for dummies on Holley's ?

[@SimpsonsSpeedShop]

There are a ton of books on holleys. I can’t recommend any off the top of my head but I know lots out there! Thanks for watching bro!

[@Torquemonster440]

David Vizard's" How to Super Tune Holley Carburetors" is great. Find it used on that Jungle website if ya can. 👍

[@stevenwilson2605]

I have the same carburetor on a 427 small block Chevy I'm trying to get the accelerator pump adjusted right any advice

[@SimpsonsSpeedShop]

I adjust after idol is set so pump activates right away but make sure it dosnt bottom out at the top end. If you still have a big when you hit it squirter size up

[@ShredGnar17]

👍🏼 🚗 🔧

[@SimpsonsSpeedShop]

Car go fast

[@johnnybrigham8154]

Hi joey very nice carb what model is it and were did you get it from? What brand are you running now for replacement of your main caps good luck johnny.

[@SimpsonsSpeedShop]

Holley ultra xp 950. It’s replacing the 750 double pumper I show in vid. thanks for watching, I think

[@johnnybrigham8154]

@@SimpsonsSpeedShop joey from were did you get it? Your victor is what model?

[@SimpsonsSpeedShop]

@@johnnybrigham8154 bought from summit racing. This is an edelbrock super victor intake old casting. Watch my porting vid to see differences between new and old victor intake. Thanks for watching

[@michaelmercurio4418]

Can you still vacuum tune idle and fuel mixture with no vacuum ports on carb? From manifold??

[@SimpsonsSpeedShop]

Ya would have to do off intake. I use a wide band o2 so no prob there.

[@michaelmercurio4418]

@@SimpsonsSpeedShop thank you!!

[@antisocialsecret7584]

Nothing for a street guy, like me 😎

[@smilsmff]

Nice what was cc of the pumps? 50 or standard 30?

[@SimpsonsSpeedShop]

Standard 30

[@smilsmff]

@@SimpsonsSpeedShop well i rewatched your videos ^ and i hope it works out for you with 750 meanwhile. I thought maybe since the 2 inch spacer was used that a 50 cc pump would help and higher volume squirters to fill the huge hole when you launch. I am going to try no spacer at track and add 1/2 inch ,+ ,+ as i test

[@SimpsonsSpeedShop]

@@smilsmff pump shot is gone by the time car leaves the line. Foot is to the floor the trans brake. A 50cc shot would do nothing.

[@thomasward4505]

Do you think the ultra XP is much better than a brawler race series carburetor which is a few hundred dollars cheaper and has almost all the same features?

[@SimpsonsSpeedShop]

I haven’t seen a brawler in real life before let alone played with one. I have seen other vids doing dyno comparison tho. On a motor with under 500 ho they would be almost identical from what that vid was saying. Truth be told tho brawlers are made in China. Soooooo

[@thomasward4505]

@@SimpsonsSpeedShop I bought the 950 racing version and it looked pretty high quality everywhere I looked, the only feature did not have was enlarged fuel bowls and the air bleed from the top, I'll let you know if it's an improvement over my standard 850

[@rosssmith4054]

Must be std to have brass filings mines the same as well as loose boosters and a stripped squirter thread

[@SimpsonsSpeedShop]

😬

[@malcolmdyer6090]

The fuel bowl sight glass, larger fuel bowls and the air idle feature Holley inherited when they bought out Barry Grant. Have a look at this video about Holley quality. kzbin.info/www/bejne/b5jCgXWZp7pnrtE

[@SimpsonsSpeedShop]

👍🏻👍🏻

[@SimpsonsSpeedShop]

And Jed at kzbin.info

[@randysmith9636]

Opps, no sound brother. Something went wrong.

[@SimpsonsSpeedShop]

I just checked seems to have sound for me, maybe check again?

[@randysmith9636]

@@SimpsonsSpeedShop It's working now, strange. I went to a couple different channels and I had sound. Anyway it's all good now.

[@SimpsonsSpeedShop]

@@randysmith9636 good stuff thanks bud

[@pockets5628]

Sorry to say, poor choice of carb. The main body on that carb has poor booster signal and turbulence causing issues with flow. If you want to hear from a couple knowledgeable guys, ask Dominic Thumper and Mark Whittener of Lightning Racing Carbs. For the money as well, you could have had a custom made by Dominic Thumper for pretty much the same cost.

[@deanstevenson6527]

I thought Brass in Pocket was a lyric from a Pretender song, not a HP Carb thing.Thats not Special.

[@SimpsonsSpeedShop]

No doubt. Thanks for watching

[@tmackinator]

Wow, that machining swarf really had the potential to wreck an expensive motor. Totally unacceptable.

[@SimpsonsSpeedShop]

Yep. Your right thanks for watching

[@tunnelportterror]

Sight glasses they copied from BARRY GRANT DEMONS lol

[@johnbnos944]

Those are the worst carbs on the market. The venturi is too big, entry and exit are wrong. It has too much emulsion, the idle feed restriction is too big and in the wrong spot. They are very fat out of the box and run very inconsistent, ask me how i know.

[@SimpsonsSpeedShop]

Yes I found this out when I went from dyno to the street. I’m running an 850!hp street now.

[@russellgillick7938]

My smartphone with all it's insane tech costs much less than this piece of caveman shit. What gives ? It should cost 200 bucks without the swarf.

[@SimpsonsSpeedShop]

It is outages thanks for watching