4 bbl or v8 - JeepForum.com

 
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post #1 of 15 Old 02-01-2014, 03:13 PM Thread Starter
89yjislanderr
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4 bbl or v8

hey folks. as my profile states, i have a 4.2 5speed. lookin to get more power. my first thought was a 4 barrel carb, but after buying one and a new 4 barrel manifold, ill have spent the same, if not more, than i wouldve on a used v8. any thouhts?

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post #2 of 15 Old 02-01-2014, 04:43 PM
Que89YJ
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There isn't enough air flow for a 4bl. Do the nutter bypass.
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post #3 of 15 Old 02-01-2014, 04:46 PM
superj
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I have a 4 barrel and will be doing a v8 sometime because the i6 still isn't as fun as I like. I have an auto tranny though

I don't feel like working on anything at this time so i sold my yj.
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post #4 of 15 Old 02-01-2014, 05:06 PM
YJ4LIFE
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It's tricky deciding which fork in the road to go down. I've stuck wiht the 4.2L and will keep it as long as it lasts and use the money I didn't spend replacing it doing other things for now. You might want to do a 4.0L head. I didn't because my 4.2L head was in good shape but it would have made my EFI swap WAYYYY easier.

'89 YJ, 4.2L, ax-15, B&M shifter, 1" BL, TJ flares, '99 intake, '91 EFI, 5.0L explorer injectors, GenRight tank & stretch, 35" ProComp Xtreme muds, 52" chevy springs rear, 44044 Ranchos front.....
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post #5 of 15 Old 02-01-2014, 05:06 PM
Que89YJ
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Super, you are running a 4-bl on a 4.2?
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post #6 of 15 Old 02-01-2014, 05:39 PM
roadyrob
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a few of us run 4 bbls. I have a holley 390cfm, along with a few other mods. it performs real well for a 6 cyl. OP, you can find deals on the manifold on ebay and craigslist. you need to check prices on a v8 swap, no way you can do it for 8-900.

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 #7 of 15 Old 02-01-2014, 06:25 PM
Que89YJ
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Quad 390? I thought the 4-bl would flow way too much gas. I have never heard of a 390 Holley! I love this forum, I learn every time I'm on here .
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post #8 of 15 Old 02-01-2014, 07:09 PM
jsawduste
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First to go is the 3.07 gears. Add some gear to the poor thing so it can at least start to stretch it`s legs a bit. It will never run well they way it is geared now.

Darryl, Ron up is St. Helen is running an 82 CJ7 with an offy intake and Edlebrock 4 BL. Played with the jetting and vacuum springs and it runs pretty darn good.
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post #9 of 15 Old 03-04-2014, 05:56 PM
1987_yj
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Quote:
Originally Posted by roadyrob
a few of us run 4 bbls. I have a holley 390cfm, along with a few other mods. it performs real well for a 6 cyl. OP, you can find deals on the manifold on ebay and craigslist. you need to check prices on a v8 swap, no way you can do it for 8-900.
I run a Holley 390 on an Offy. I have a dead spot I am trying to overcome. Can you point me in the direction of some threads to help with this? I have changed a wealth of carb parts. I am stuck.

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post #10 of 15 Old 03-04-2014, 07:10 PM
roadyrob
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Quote:
Originally Posted by 1987_yj View Post
I run a Holley 390 on an Offy. I have a dead spot I am trying to overcome. Can you point me in the direction of some threads to help with this? I have changed a wealth of carb parts. I am stuck.

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this might help

http://www.junkyardgenius.com/holley/tune01.html

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 #11 of 15 Old 03-04-2014, 07:52 PM
superj
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I am running a 450 holley but the 390 is run by a few local guys on aftermarket intakes and they really like them

I don't feel like working on anything at this time so i sold my yj.
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post #12 of 15 Old 03-07-2014, 01:01 PM
zeus87gn
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Quote:
Originally Posted by 1987_yj View Post
I run a Holley 390 on an Offy. I have a dead spot I am trying to overcome. Can you point me in the direction of some threads to help with this? I have changed a wealth of carb parts. I am stuck.
http://www.holley.com/TechService/Library.asp

Pay attention to the Power Valve section
You may need to change it to a faster one - I had to to overcome my stumble

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Holley Carb thread
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post #13 of 15 Old 03-07-2014, 01:03 PM
zeus87gn
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Quote:
Originally Posted by jsawduste View Post
First to go is the 3.07 gears. Add some gear to the poor thing so it can at least start to stretch it`s legs a bit. It will never run well they way it is geared now.
^^ This ^^ is the first problem

Then concentrate on your tune and get the ignition fixed up and bypassed
(if it hasn't been done already)

Handicapped license plates are not for mentally handicapped people -

"Man has not yet evolved an inch from the primordial slime that spawned him." Mark Blankfield, Jekyll & Hyde... Together again

Holley Carb thread
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post #14 of 15 Old 03-09-2014, 09:22 AM
1987_yj
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Thanks! I have replaced the power valve with stock size but I will check the vacuum again and compare

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post #15 of 15 Old 03-09-2014, 09:36 AM
0III0forlife
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I too run a Holley 390 CFM. After going from the Carter to a Weber, to a MC2150, then getting pissed and putting on an Edelbrock 600, I opted for the Holley.

But it requires some add-ons to perform well...Such as fuel pressure regulator, and some springs on the floats to prevent cutout when climbing a hill. Knock on wood, it has been performing to my liking for over a year now.
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