Holley Jets?
Thread Starter
Senior Member since 1492
Joined: Aug 2000
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From: Just because I'm paranoid doesn't mean people aren't out to get me...
St. Jude Donor '09
Holley Jets?
You Holley guys who change jets, Do you buy the individual jets or did you buy one of the "jet" kits.
Reason I'm asking is that I'm stepping up to a 4150 and will probably need to adjust the jets somewhere along the line.
Thanks
Len
Reason I'm asking is that I'm stepping up to a 4150 and will probably need to adjust the jets somewhere along the line.
Thanks
Len
Race Director
Joined: Nov 2000
Posts: 11,872
Likes: 12
From: Waterloo ontario Canada
:
I bought 2 kits because I have 2 carbs but it is still cheaper in the long run.
From my experience holleys are too rich, not too lean and the richness comes from the idle circuit and not the jetting.
I really leaned out my carbs and did it all from the idle circuit and left the jets alone.
Originally Posted by Gordonm
Get the kit. Keeps them organized and you have a wide selection to choose from. Cheaper by the bulk also.
I bought 2 kits because I have 2 carbs but it is still cheaper in the long run.From my experience holleys are too rich, not too lean and the richness comes from the idle circuit and not the jetting.
I really leaned out my carbs and did it all from the idle circuit and left the jets alone.
Safety Car
Joined: Jul 2002
Posts: 3,770
Likes: 3
From: St Louis MO
I just bought a few sets from the local speed shop....but prolly spent enough to buy the kit. You really need the book(s) to give you the knowledge of how the circuits work and interact if you're going to do any serious tuning. Also, while you can read plugs, an O2 sensor will be a much better tuning tool. Are you still messing around that 3310???
Brett
Brett
Le Mans Master
Joined: Mar 2004
Posts: 7,403
Likes: 1,447
From: Little Rock AR
I started out buying individual jets at first but that got old quick. If you buy a box full you have something to keep them organized and a glance inside the box will remind you which pair are in the carb if you did not take good notes.
I bought a Holley quick-change jet kit because it looks to be easier than pulling off the hard lines each time I want to change jets on my Holley. The quick change kit includes a special fuel bowl that has 2 removable plugs in front that you can unscrew and access the jets with a screwdriver like jet tool. Not the greatest thing since sliced bread but I would probably buy it again. Makes jet swapping a 2 minute job as long as you are careful not to knock the jet off the tool.
If you realy want to learn how to tune your Holley, you need to read up the info on this web page. This is the best page on the net as far as I know concerning Holley tuning. I like it even better than the books put out by Holley.
Simple and very informative.
http://www.bob2000.com/carb.htm
-Mark.
I bought a Holley quick-change jet kit because it looks to be easier than pulling off the hard lines each time I want to change jets on my Holley. The quick change kit includes a special fuel bowl that has 2 removable plugs in front that you can unscrew and access the jets with a screwdriver like jet tool. Not the greatest thing since sliced bread but I would probably buy it again. Makes jet swapping a 2 minute job as long as you are careful not to knock the jet off the tool.
If you realy want to learn how to tune your Holley, you need to read up the info on this web page. This is the best page on the net as far as I know concerning Holley tuning. I like it even better than the books put out by Holley.
Simple and very informative.http://www.bob2000.com/carb.htm
-Mark.
Race Director
Joined: Mar 2001
Posts: 11,322
Likes: 1
From: Living in the Hartland
Originally Posted by stingr69
I started out buying individual jets at first but that got old quick. If you buy a box full you have something to keep them organized and a glance inside the box will remind you which pair are in the carb if you did not take good notes.
I bought a Holley quick-change jet kit because it looks to be easier than pulling off the hard lines each time I want to change jets on my Holley. The quick change kit includes a special fuel bowl that has 2 removable plugs in front that you can unscrew and access the jets with a screwdriver like jet tool. Not the greatest thing since sliced bread but I would probably buy it again. Makes jet swapping a 2 minute job as long as you are careful not to knock the jet off the tool.
If you realy want to learn how to tune your Holley, you need to read up the info on this web page. This is the best page on the net as far as I know concerning Holley tuning. I like it even better than the books put out by Holley. Simple and very informative.
http://www.bob2000.com/carb.htm
-Mark.
I bought a Holley quick-change jet kit because it looks to be easier than pulling off the hard lines each time I want to change jets on my Holley. The quick change kit includes a special fuel bowl that has 2 removable plugs in front that you can unscrew and access the jets with a screwdriver like jet tool. Not the greatest thing since sliced bread but I would probably buy it again. Makes jet swapping a 2 minute job as long as you are careful not to knock the jet off the tool.
If you realy want to learn how to tune your Holley, you need to read up the info on this web page. This is the best page on the net as far as I know concerning Holley tuning. I like it even better than the books put out by Holley.
Simple and very informative.http://www.bob2000.com/carb.htm
-Mark.
Have had to fish a few jets out with a wire, not fun. 
To bad they don't add some real metal to them so a magnet could be used.
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Race Director
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
I look at it like this, I am only going up or down a few jet sizes, so I only buy what I need I have accumulated enough to cover the primary and secondary jet sizes I need for my motor, the kit comes with too many ( too small or too large ) sizes I will never use. 
Thread Starter
Senior Member since 1492
Joined: Aug 2000
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From: Just because I'm paranoid doesn't mean people aren't out to get me...
St. Jude Donor '09
Originally Posted by Brettmc
Are you still messing around that 3310???
Brett
Brett
Too funny Brett.I'm going to switch to a 4150 today if the leaves let up.
Melting Slicks
Joined: Jul 2003
Posts: 3,204
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From: Pomfret, CT
Finalist 2020 C4 of the Year - Unmodified
Originally Posted by cw823
Forgive me if I ask a stupid question, but #1 how do you know that you need to change jets, and #2 how do you know (when changing jets) that you finally have it right?
By the condition (coloring) of your spark plugs after a WOT run. They will either show to rich or to lean!
-Rick
Team Owner
Joined: Apr 1999
Posts: 21,953
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From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Years ago I went to some place like Auto-Zone and bought the the Holley jet kit box with two of each for everything from #60 - #120
I also have smaller Max-Jet bar with all the decimal nut driver jets.
You won't ever use more that 20% of them, but it makes them handy to loan out also
I also have smaller Max-Jet bar with all the decimal nut driver jets.
You won't ever use more that 20% of them, but it makes them handy to loan out also
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,443
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Oh, I should add that the nice box with all the compartments nicely lettered was also something like $35 bucks. I couldn't believe how cheap it was. It only take a few times changing jets at $3-5 dollars to add to $35 anyway.
It has room in the box for power valves, extra jets, different boosters, new needle and seats. No more running to the store 10 miles away when your working on some project or out at the races helping on some other car.
It has room in the box for power valves, extra jets, different boosters, new needle and seats. No more running to the store 10 miles away when your working on some project or out at the races helping on some other car.
Race Director
Joined: Mar 2001
Posts: 11,322
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From: Living in the Hartland
Originally Posted by The Dude
The problem with the kits is that you're paying for jet pairs you'll never use.
Melting Slicks
Joined: Apr 2000
Posts: 3,286
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From: San Jose California
Originally Posted by norvalwilhelm
:
From my experience holleys are too rich, not too lean and the richness comes from the idle circuit and not the jetting.
I really leaned out my carbs and did it all from the idle circuit and left the jets alone.
From my experience holleys are too rich, not too lean and the richness comes from the idle circuit and not the jetting.
I really leaned out my carbs and did it all from the idle circuit and left the jets alone.
I never imagined how much this was true until I got my digital exhaust analyzer. The idle circuit affected the mixture all the way up to and including highway cruising speeds. This is with just the four corner idle screws! I can change from around 13:1 a/f to over 15:1 a/f with just the idle screws at cruising speeds. Even 1/8th of a turn makes a very significant difference over a broad rpm range.
For power settings once the secondaries are beginning to open, jet changes make the difference. Get the kit.
Chuck
Thread Starter
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From: Just because I'm paranoid doesn't mean people aren't out to get me...
St. Jude Donor '09
As far as jet size. Does a 84 jet have a larger or smaller opening than a 74? Is it that the higher numerically gives a larger opening?
Safety Car
Joined: Jul 2002
Posts: 3,770
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From: St Louis MO
The larger the number the more gas it will flow. Sometimes the openings are larger to get more flow, sometimes just the entry and exit are changed to change flow from one jet to the next.
Tell ya what, Len. I'll make a gift of one of my Holley books to you if you IM me your mailing address. Feliz Navidad!!
Brett
Tell ya what, Len. I'll make a gift of one of my Holley books to you if you IM me your mailing address. Feliz Navidad!!
Brett
