Holley Carb Tuning Tips! | Engine Masters | MotorTrend

Ahhh, the Holley 4150. Released in the late ’50s, it has been the gold standard for performance carburetion ever since. Seemingly everyone has one, but do you really know how to tune one? Stream Engine Masters Presented by Amsoil NOW on MotorTrend+ ➡️ motortrend.app...
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[@WS-gw5ms]

Im shocked that you say nobody messes with the cams. I've had a holley tune box with cams and all the needles. Im no racer butt I had it since I was 16 makes a huge difference.

[@joemulatto19]

Exactly, I've been tuning Holleys for decades... I'd say that there is no one tunable item that I've tweaked more than the others

[@therealnynetynyne360]

This is why I love this dude the cam adjustment was new for me never fails dude is a legend

[@TwoBlackMarks]

I would recommend the "opposite" of Freiburger, get a set of different pump cams first, it makes a big difference. Most of the pump cams has different positions you can put them in too, to move the geometry around. It has a lot of possibilities to when and how much fuel you add vs. just a "bigger hole" The best would be to of course have both several nozzles and cams available, but different pump cams should be enough for most normal applications, it is somewhat more time consuming to change the cam though, since you have to readjust the pump lever after an change, especially big changes. But fine tuning an carburetor usually takes a lot of time anyway.

[@Troy_Built]

I always go for the cams first.

[@jonathanrobertson4969]

agreed

[@mark_osborne]

Wow does this ever take me back in time !

[@wirefly1000]

I love Holleys and I think they are the best. Many people say they are junk. Truth is, they just don’t know how to tune them. I didn’t either until I bought a book about it and read it front to back. I then built a 4bbl for my 67 F100 that would spin all 4 tires with posi, pickup speed going uphill and built a 2bbl 350 for my dads 75 3/4 ton 390ci that got 13 miles to the gallon on a good day and would pick up speed going uphill with 1-1/4 cords of green aspen in the bed.

[@johnruiz6599]

i have a 1972 ford f100 with a 390 and i am trying to figure out the carb i have a holley 750 double pumper and i need help tuning it. Do you think you could give me some tips?

[@wirefly1000]

factory cam?@@johnruiz6599

[@johnbehneman1546]

Great video David!!! Thanks for sharing and I learned so much.

[@peggyparrow2059]

In most of my hubbys street hot rod motors, the green cam works best in number 1 position .

[@rogerrabbito4517]

Holly can be a bit of an experience lol. I had a 650 on my old 71 Mach 1 351 Cleveland. Once i found the sweet spot? O my! She went like a bullet! GL and here's some advice. When you BUILD it? The trophy 🏆 looks MUCH better sitting in the display. - RR -

[@AnnaTotani-ww5xv]

How do people in Australia get the MotorTrend app? I miss watching these videos weekly

[@ironmaiden5658]

I still have my box of power valves and jets from my Holley 465 on a 4.1, 6 cylinder crossflow days.

[@atv_lifestyle]

Future engine master ideas I’d like to see would be sbf fuel injected manifold shoot out!

[@blubu68]

I never play with the Accelerator cams to cover a bog. I think most of the problem is the transition slot is exposed. They should do a show on drilling the throttle blades to set the T-slot properly

[@johnnyhonda7576]

I saw this full video and secondary power valve tuning really wasn’t discussed. Can this be elaborated on

[@robertlambert5299]

MotorTrend you’re killing our feeds! Give it a break……we will still watch.

[@THROTTLEPOWER]

Great vid!!!!!!! 👍👍👍

[@AimlessMoto]

Cams are easier to tune with. Especially since most can be clocked for two or even three different positions on the same cam.

[@dave85oldschoolmonte]

I don’t have a dead spot I’m fowling plugs it will run good and then it don’t my plugs are black it’s to rich. 750 brawler on eight signature series 383 stroker I’m not having good luck some help would be great ty

[@RobertoHx]

That may be too big of a carb for that motor, how many rpm are you turning?

[@steve6992]

Never at any time are you supposed to have an air gap at the accelerator pump in the idle position, the proper way to adjust an accelerator pump is to manually the press down on the lever coming from the accelerator pump at that point you should have .015" clearance at wide open throttle, Holley does is so you don't over stroke the accelerator pump and ruin the diaphragm

[@johnadams9044]

Freiburg is a street rod guy's best friend.

[@TransAm1977]

Nobody messes with the cams? They probably should.

[@johngreen2510]

Perhaps so but as this gentleman states…I, too, have never seen a carb tuned with a new cam in place.

[@danielwhite5293]

what about edlebrock?

[@CashMopar]

It sucks.

[@EddieBowen-s5i]

Throw in trash bin

[@awesomesexy5534]

Holley yunk

[@timorgano]

I can't get MTOD or M+ in the UK. Why not?

[@Whopoopedinmypants]

Because you live in a dystopian nightmare lol

[@timorgano]

@@Whopoopedinmypants Aye, true.

[@jamesnicholson1686]

You stay away from my carburetor

[@tomreyn3610]

So?

[@tomsmith4066]

That was nonsense