Holley 4150 carburetor tuning “secret” you probably don’t know about.

You are never too old to learn something new

I'll give that a try on my 750 double pumper Holly that goes to by 327

It doesn't give you the ability to adjust the timing of the secondaries opening. It only allows you to change the opening point from stock to a point dictated by the position of the second hole and the length of the adjustable link. The adjustable link can only be one length, the length that places the secondary throttle blades at fully open when the primary throttle blade reaches fully open.

Thanks once again Tyler. I work for Lordco here in BC Canada which is an automotive parts retailer. I ordered this product from here and will be arriving on Tuesday. I pay about 45% off of retail. Keep up the great videos 😊

I was just tinkering with my Proform 750, before watching this. I noticed a high pitch squeal/whistle, when secondaries open. Never noticed it before. Maybe because the engine was louder at the point that they open, stock. Sounds like a compressor engine. I think I heard it on yours as well.

do you know how many times you said "these guys" "that guy" ect, ect, i got ill listening to that yankey nonsense!

Holley has quite a scam going. Buy a $500 carb.......then buy $250 worth of stuff to "tune" it.

He doesn't know how to get the most out of a 4150

You can make all 4 butter flys open at once if you don't care about gas mileage ,I think you should have just went up in # on the squiters ,if you had the correct power valve ,check vacuum say its 20 so you need a #10 power valve then dial in the squiters then the accelerator pumps and then the jets

What is the exhaust set up on the engine running right when the video begins

I noticed you move the throttle twice on your fast rev up. On second blip to get instant RPM I believe you are carrying over from the accelerator pump shot on the first blip. I believe you double blip to keep from bogging. Then, what the hell do I know? I did the horrible thing on vacuum secondary Holley to put the screw in to override the vacuum diaphram on the linkage. Take it out to get fuel milage on trips. Going to race, put the screw back in. Had 4 speed, so no problem pulling up against torque converter.

Thank you for great information & sharing your thoughts and progress. Like you I've been chasing & refining my tune for a while - this is one I'll have to try.
One of the greatest improvements in throttle response came from the installation of Thompson performance power blast plates to both primary and secondary sides, particularly with the heavy accelerator pump shot I needed. Cheers Mike

Hey buddy I’m trying to get tps sensor kit for a double pumper street hp carburetor I’m running 4r70w electronic transmission do you know something I can use?!

Thanks for sanding that down after drilling it, my OCD was going crazy!! LOL!!
I suppose a 1 to 1 setup would be perfect for drag racing.

When adjusting use a small square to be sure you are right on!

A specialist in Webber/Holley conversions converted a 850 years ago. This actually should be a way better carburetor but I never hear good reports about them. Is this something I should be concerned about as I haven't got my build finished to use it. What can you tell me ?

355 smallblock chevy enging high conpresion motor 12.5

when car gets hot not runing right turn off

my distributer dosnt turn when enging his hot

Should I do the mod or doodoo the mod.? lol

Cool video. Question, did you square up the power valve and jetting primary to secondary? Seems like that is a must if you make this change.

Great videos,
Frustrated with idling in gear at a light and loading up. I am going to have to increase my stall speed but do not want it to be to loose.
I have a comp hyd roller 286. 230/236, 350ci, 10:1, 67 nova 355's
I have the holeshot 2400. I like that it is tight on cruise but think I need to go to the 3000.
Wondering what stall you have?

Thank you for posting. Great info. I made the part for 5, at 45 dollars it was high just to see if it worked.
Well...it worked great. definitely picked up some snap. First hop on the street the shift light came on quick, I shifted, it stayed on. I usually do not lift when shifting, definitely had some wheel spin.

So by installing this linkage and making adjustment for the secondary to open 1:1 this will open up my secondary sooner BUT will I need to eliminate my rear power valve in order for this to work

Sounds like to much transfer slot used up to get idle drill .093 holes in
Blades to shut them down so .020 shows tranfers are acc. Pump shot
Before. Shot from above.

Is that a Yong Heng compressor I see

Mr. Sparkles RULES!!!! sweet mod!

Will this improve the fuel mileage on my 454? 😎 Great vid!

Following your channel since 6 months ago, you make the best how to tune videos!
I rarely comment on videos but i really appreciate what you do and you teach me alot!
You even inspire me to start youtubing soon to.
Million thanks from Sweden

Thank You Very Much!!💪💯

Great info!!

So your secondary pump is coming in sooner to fix the lean part throttle condition?

Do you have fixed timing with this. (Locked out, no wieghts)

I’m not even Carb and find this useful,

Did you by chance try tuning the power valve restrictors?

I never knew this! thanks for sharing!

Good stuff!
Thanks for sharing brother !!

With his monster truck is has his secondary’s open up at the same time as his primary’s and it still needs more 😳

We use to bend the factory linkage to get them to open sooner

When you hitting the track?

What kind of under hood light do you have? Looks like it gives a good amount

Thanks for the good info, love the truck