What do I need to make a Holley carb work on stock 258 manifold - JeepForum.com
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post #1 of 62 Old 05-18-2019, 09:38 AM Thread Starter
agear
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What do I need to make a Holley carb work on stock 258 manifold

I'm looking to get a Holley for my 258. I want to keep using the stock 258 bbl intake manifold . What are the options ?


1984 jeep cj7, 258 I6, rebuilt T176,rebuilt Dana 300, amc 20 , dana 30, 4.10's Trac-lok in rear , 4.10's detroit soft locker in dana 30, 2.5 inch bds suspension lift, 1 inch polyurethan body mount lift. Line ex. weber carburetor. factory tach. factory clock ,oem replacement speedomter cluster, and oil pressure gauge, factory volt gauge.
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post #2 of 62 Old 05-18-2019, 09:49 AM
Shawn Watson
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Are you talking about a Holley 4-barrel on a stock, I6 intake? I sure hope not


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post #3 of 62 Old 05-18-2019, 03:20 PM Thread Starter
agear
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Originally Posted by Shawn Watson View Post
Are you talking about a Holley 4-barrel on a stock, I6 intake? I sure hope not [IMG class=inlineimg]/forum/images/JeepForum_2016/smilies/tango_face_surprise.png[/IMG]


Shawn
Any Holley......

1984 jeep cj7, 258 I6, rebuilt T176,rebuilt Dana 300, amc 20 , dana 30, 4.10's Trac-lok in rear , 4.10's detroit soft locker in dana 30, 2.5 inch bds suspension lift, 1 inch polyurethan body mount lift. Line ex. weber carburetor. factory tach. factory clock ,oem replacement speedomter cluster, and oil pressure gauge, factory volt gauge.
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post #4 of 62 Old 05-18-2019, 03:46 PM
Shawn Watson
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I bet a Motorcraft 2150 would be a reasonable test.


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post #5 of 62 Old 05-18-2019, 08:01 PM Thread Starter
agear
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Looks like I can adapt to a Holley 2300 series bolt pattern. Does anybody know if I can adapt to the stock 258 air cleaner to this Holley 2300 series street avenger ?

1984 jeep cj7, 258 I6, rebuilt T176,rebuilt Dana 300, amc 20 , dana 30, 4.10's Trac-lok in rear , 4.10's detroit soft locker in dana 30, 2.5 inch bds suspension lift, 1 inch polyurethan body mount lift. Line ex. weber carburetor. factory tach. factory clock ,oem replacement speedomter cluster, and oil pressure gauge, factory volt gauge.
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post #6 of 62 Old 05-19-2019, 07:53 AM
gutthans
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Looks like I can adapt to a Holley 2300 series bolt pattern. Does anybody know if I can adapt to the stock 258 air cleaner to this Holley 2300 series street avenger ?
I'm pretty sure anyone that's run a Holley on a 258 with the stock cleaner is dead...

If you aren't going to lose the stock intake, go with a Motorcraft 2150. If you insist on a Holley, use the 350 cfm 2-barrel and run a 9" or 10" aftermarket filter.

There's an old saying about trying to make a silk purse out of a sow's ear (trying to dress up a pig).
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post #7 of 62 Old 05-19-2019, 09:34 AM
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Originally Posted by gutthans View Post
I'm pretty sure anyone that's run a Holley on a 258 with the stock cleaner is dead...

If you aren't going to lose the stock intake, go with a Motorcraft 2150. If you insist on a Holley, use the 350 cfm 2-barrel and run a 9" or 10" aftermarket filter.

There's an old saying about trying to make a silk purse out of a sow's ear (trying to dress up a pig).
^^ That ^^

I personally think Holley's are one of the most over rated carbs out there. 'Back in the day' when carbs were all we had, I tried a Holley on my 67 Camero....Ran good....but putting the Rockester Q-Jet back on made it run better....and it got better gas mileage.


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post #8 of 62 Old 05-19-2019, 10:37 AM
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Any Holley......
You have to be more specific.


What are you trying to do?


What improvements are you trying to get?


If all you want is to install a Holly simply for that purpose, I recommend a couple of stickers on the fender and call it good.
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post #9 of 62 Old 05-19-2019, 12:46 PM Thread Starter
agear
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Quote:
Originally Posted by agear View Post
Looks like I can adapt to a Holley 2300 series bolt pattern. Does anybody know if I can adapt to the stock 258 air cleaner to this Holley 2300 series street avenger ?
I'm pretty sure anyone that's run a Holley on a 258 with the stock cleaner is dead...

If you aren't going to lose the stock intake, go with a Motorcraft 2150. If you insist on a Holley, use the 350 cfm 2-barrel and run a 9" or 10" aftermarket filter.

There's an old saying about trying to make a silk purse out of a sow's ear (trying to dress up a pig).

Why do you say you're pretty sure anyone who has tried to use a stock 258 cleaner on a Holley is dead

1984 jeep cj7, 258 I6, rebuilt T176,rebuilt Dana 300, amc 20 , dana 30, 4.10's Trac-lok in rear , 4.10's detroit soft locker in dana 30, 2.5 inch bds suspension lift, 1 inch polyurethan body mount lift. Line ex. weber carburetor. factory tach. factory clock ,oem replacement speedomter cluster, and oil pressure gauge, factory volt gauge.
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post #10 of 62 Old 05-19-2019, 01:44 PM
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Why do you say you're pretty sure anyone who has tried to use a stock 258 cleaner on a Holley is dead
Well, in a word...sarcasm. Old farts and people throwing on Holleys when it was a thing back in the day. Dead to the Jeep world by now , maybe actually dead. I don't come across people trying to do that anymore. Heck, I don't find many trying to install Holleys (except myself).

The stock air cleaner isn't well suited to a cfm improvement, particularly Holley/Edelbrock/Carter designs that need flow around the perimeter of the inlet flange, and like it coming in straight and above the inlet. Stock designs that push the filter below or level with the inlet and restrict air to a limited entry point don't work well for improved horsepower. That's a compromise design that maximizes hood space and plumbs all of the crazy emissions hardware. Plus, of course the idle warm-up benefit of the vacuum door on the cleaner snout (which is actually a good idea).

The stock cleaner is a restoration on an original, and perfectly good for around town grocery trips.
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post #11 of 62 Old 05-19-2019, 02:31 PM Thread Starter
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Quote:
Originally Posted by agear View Post
Any Holley......
You have to be more specific.


What are you trying to do?


What improvements are you trying to get?


If all you want is to install a Holly simply for that purpose, I recommend a couple of stickers on the fender and call it good.
Lol. For better performance. A better fuel air mixture

1984 jeep cj7, 258 I6, rebuilt T176,rebuilt Dana 300, amc 20 , dana 30, 4.10's Trac-lok in rear , 4.10's detroit soft locker in dana 30, 2.5 inch bds suspension lift, 1 inch polyurethan body mount lift. Line ex. weber carburetor. factory tach. factory clock ,oem replacement speedomter cluster, and oil pressure gauge, factory volt gauge.
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post #12 of 62 Old 05-19-2019, 10:16 PM
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Stock air cleaner has too small of a hole to fit the holley 2300/motorcraft 2150, they need the larger 5 1/8" carb top flange and your stock air cleaner is 2 5/8". You can look for a holley 2280 off of a late 70's early 80's dodge v-8. bigger jets than your stock bbd and the air cleaner fits, but you either have to drill the hole in the lid bigger or swap over the bail/stud from your stock bbd to the holley. have to do a bit if adapting on the throttle linkage, but have to do that with most any different carb.

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post #13 of 62 Old 05-20-2019, 06:02 AM
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Lol. For better performance. A better fuel air mixture
Off idle performance? Mid range? WOT?


Smaller carbs work better for low and mid range work (that would be the 350 CFM model).


Maintaining the stock intake pretty much eliminates a 4BBL.



Installing any of the Holley 2BBL's is going to be about the same procedure as swapping on a 2100. Lots of info here on that swap.



On a side note, I've always wondered why nobody looks at the Rochester 2G series 2BBL. They came in a number of sizes and used a mechanical power valve which eliminates leaking.

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post #14 of 62 Old 05-20-2019, 07:32 AM
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On a side note, I've always wondered why nobody looks at the Rochester 2G series 2BBL. They came in a number of sizes and used a mechanical power valve which eliminates leaking.

IIRC the Rochester 2G is a different bolt pattern from both the BBD and the 2100 series. There I believe are also 2 different Rochester 2bbl bolt patterns. so getting the correct adapter can be a bit of a chore.

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post #15 of 62 Old 05-20-2019, 07:59 AM
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Lol. For better performance. A better fuel air mixture
Look at the manifold itself; the bores are already smaller than the throttle plates on your Weber and they shotgun the mixture right into the plenum heater.


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