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post #1 of 10 Old 09-01-2014, 08:11 PM Thread Starter
jasonjones21
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Intake

Hat do you guys think of the Clifford performance 4 bbl intake with a 4 bbl carb how does the 258 run with that setup "any more power ??"

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post #2 of 10 Old 09-01-2014, 08:36 PM
mrmud4x4
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I have the Motorcraft 4 barrel carb....I put it on the stock intake. It's the biggest the jeep can handle...about 350 cfm. I did not want to change the intake mainly because I did not want to put exhaust headers on it.

If you do the intake and headers....probably be great.

It runs way stronger...And my main reason was no stalling on an incline, especially when I need to hit it...

I did the nutter bypass.

It does run a little rich....No smog check here in NC.

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post #3 of 10 Old 09-01-2014, 09:16 PM
mike134
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I love my 89 4.2L MPFI!! It looks like the prices are getting out of control though
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post #4 of 10 Old 09-01-2014, 09:28 PM
chris142
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imo a 4bbl is overkill for a 258. holley makes a 350cfm 2 bbl thats plenty.thats my take on it anyway
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post #5 of 10 Old 09-01-2014, 09:33 PM
Tom95YJ
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Quote:
Originally Posted by chris142
imo a 4bbl is overkill for a 258. holley makes a 350cfm 2 bbl thats plenty.thats my take on it anyway
Same here. I run a weber 38/38 I've read it's a 390cfm carb. It sucks in more air then my 258 can push out with 2.5" exhaust.

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post #6 of 10 Old 09-01-2014, 09:53 PM
Chrisnvegas
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I had the Offenhauser intake and a Holley 390 with a cam and header. (my old CJ7)
The 390 was not too big for a cam and header.

Let's just say it woke up. It would smoke the tire down the block. I said tire because it had a rear open diff.

4 barrels get good fuel mileage if you can keep your foot out of it. I couldn't.

What happens in my Jeep, stays in my Jeep
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post #7 of 10 Old 09-02-2014, 09:38 AM Thread Starter
jasonjones21
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Will a Clifford performance 6=8 intake/header/weber pass smog in Denver?
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post #8 of 10 Old 09-02-2014, 10:08 AM
Chrisnvegas
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Denver is as strict as California. No, it will not pass.

If you are moving there and aren't dead set on living in Denver proper, you can move to the outskirts where there is no testing. Places like Evergreen, Conifer, Idaho Springs.
They are 30 minutes outside of Denver. (Those are foothills areas)

Just make sure you are in Clear Creek County, Parts of Weld County ect.
I prefer the more rural areas anyway.

Only other thing you can do is fuel injection.

What happens in my Jeep, stays in my Jeep
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post #9 of 10 Old 09-02-2014, 10:20 AM
roadyrob
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I also have the offy manifold and holley 390, its a great setup but you do need to run a complete package to get its full potential, ignition, cam and exhaust. BUT, if you have to pass emissions you will do better running fuel injection. A good carb man with an EGA could set the carb to pass but there aren't many carb men left.

Do everything with a positive attitude, it won't always work but you'll piss enough people off to make it worthwhile.

the voices aren't real but they sure have good ideas.
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post #10 of 10 Old 09-02-2014, 10:35 AM
superj
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the four barrel was a great upgrade on my 87 wrangler. got better gas mileage and took off quicker. the intake made it a lot easier to fit the four barrel and made it look cleaner. i had the offenhauser intake instead of the clifford.

i had the weber 34 carb first. junk
then a motorcraft 2100. mmmeh, it was ok.
then a motorcraft 2150. same thing, meh.
then a holley two barrel from a 68 dodge car, it was freaking badass!!

then a holley 450 four barrel on offenhauser intake. improved gas mileage and performance and never gave me a bit of trouble.

but that two barrel holley from that old dodge car was the best off all the different carbs i tried.

the four barrel got hte best gas mileage though because the two primary barrels are smaller then what comes on a two barrel carb.

I don't feel like working on anything at this time so i sold my yj.
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