4.2 Cylinder Head Overhaul?? - JeepForum.com
 
LinkBack Thread Tools
post #1 of 11 Old 09-30-2013, 08:08 PM Thread Starter
JeepingShtHpns
Registered User
1988 YJ Wrangler 
 
Join Date: Mar 2013
Location: Canyon Country
Posts: 28
4.2 Cylinder Head Overhaul??

My 88' hasn't been messed with in a while and I don't feel like i can rely on him fully yet.
I want to overhaul or rebuild my cylinder head.

When i changed a head gasket about a year ago it was bad in there. But now I have time and some cash to do it and i wanna get it done. However I need some help, I know how to take it a part and put it back.

Is there kits? (I couldn't find any)

What parts do I need? (I know the basic stuff like valves, springs, push rods rocker arms...)

what are good/performance parts I should use?

Upgrades???

Tips/Advice?

Thanks for helping out a fellow jeeper

JeepingShtHpns is offline  
Sponsored Links
Advertisement
 
post #2 of 11 Old 09-30-2013, 08:53 PM
Tom95YJ
[] Eye'd Jeep Connoisseur
 
Tom95YJ's Avatar
1999 XJ Cherokee 
 
Join Date: Sep 2004
Location: Salt Lake City
Posts: 9,548
Garage
Quote:
Originally Posted by JeepingShtHpns
My 88' hasn't been messed with in a while and I don't feel like i can rely on him fully yet. I want to overhaul or rebuild my cylinder head. When i changed a head gasket about a year ago it was bad in there. But now I have time and some cash to do it and i wanna get it done. However I need some help, I know how to take it a part and put it back. Is there kits? (I couldn't find any) What parts do I need? (I know the basic stuff like valves, springs, push rods rocker arms...) what are good/performance parts I should use? Upgrades??? Tips/Advice? Thanks for helping out a fellow jeeper
I hear of guys running Chevy valves , with a nice comp cams camshaft , lifters and valve springs. I would port the head and run a offenhauser intake with a holly 470 truck advenger. That'll really wake up the 4.2 from what I've read.

To be honest for 4.2 tech info the CJ section is the place to go

'89 YJ The Smurf
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

'99 XJ Black Betty
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Tom95YJ is offline  
post #3 of 11 Old 09-30-2013, 09:16 PM
Chrisnvegas
Web Wheeler
 
Chrisnvegas's Avatar
1992 YJ Wrangler 
 
Join Date: Dec 2012
Location: The Desert
Posts: 6,136
Quote:
Originally Posted by Tom95YJ View Post
I hear of guys running Chevy valves , with a nice comp cams camshaft , lifters and valve springs. I would port the head and run a offenhauser intake with a holly 470 truck advenger. That'll really wake up the 4.2 from what I've read.

To be honest for 4.2 tech info the CJ section is the place to go
Yes...

I ran the Holley 390 cfm. It was purrfect!
I started with @ 500 cfm, but it was a bit much. Had a stumble just off idle that I couldn't get rid of. Plugs were always black and wet.

The 390 combined with a Clifford header and my CJ was one happy camper.

"Get off my lawn"
Chrisnvegas is offline  
 
post #4 of 11 Old 09-30-2013, 11:44 PM Thread Starter
JeepingShtHpns
Registered User
1988 YJ Wrangler 
 
Join Date: Mar 2013
Location: Canyon Country
Posts: 28
i just bought a new Carter 2bb like 4 months ago, which costed some change so i am going to run that for a while. but i have heard a lot of good stuff about those carbs. i wont to up grade that when i do my intake and exhaust headers. Thanks
JeepingShtHpns is offline  
post #5 of 11 Old 09-30-2013, 11:46 PM
Tom95YJ
[] Eye'd Jeep Connoisseur
 
Tom95YJ's Avatar
1999 XJ Cherokee 
 
Join Date: Sep 2004
Location: Salt Lake City
Posts: 9,548
Garage
Quote:
Originally Posted by JeepingShtHpns View Post
i just bought a new Carter 2bb like 4 months ago, which costed some change so i am going to run that for a while. but i have heard a lot of good stuff about those carbs. i wont to up grade that when i do my intake and exhaust headers. Thanks

There is nothing Good about the Carter BBD carb, Which is why everyone with a YJ, and CJ swap them for Webbers, and Motorcraft 2100's, Holleys

'89 YJ The Smurf
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

'99 XJ Black Betty
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Tom95YJ is offline  
post #6 of 11 Old 10-01-2013, 03:57 AM
roadyrob
Registered User
1987 YJ Wrangler 
 
Join Date: Apr 2007
Location: west palm beach fl
Posts: 1,986
if you look in the exhaust ports you will see a casting ridge, remove it with a die grinder. port match the head to the intake manifold, there are videos on you tube that show how to do it. take about 10 thousands off the head to up the compression, your machine shop should be able to tell you the exact amount.
X2 on changing the intake manifold, I run a offenhauser manifold with a holley 390, great setup.
be sure to change the exhaust, you won't see much of an increase if you keep the stock setup. a header would be nice, but I run the stock manifold and down pipe into a 2 1/2" high flow cat and muffler.

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.
roadyrob is offline  
post #7 of 11 Old 10-01-2013, 01:00 PM
c5wagner
Registered User
1989 YJ Wrangler 
 
Join Date: Sep 2013
Location: Highland
Posts: 82
Quote:
Originally Posted by JeepingShtHpns View Post
i just bought a new Carter 2bb like 4 months ago, which costed some change so i am going to run that for a while. but i have heard a lot of good stuff about those carbs. i wont to up grade that when i do my intake and exhaust headers. Thanks
What good have you heard of the stock Carter bbd? I swapped mine out for a motorcraft 2100, nutter bypass, and did a TFI ignition upgrade and I love the power my 4.2l puts out now. I also rebuilt my engine which didn't liven it up as much as I hoped, but the other mods I listed above did the trick

1989 Base YJ TBI 350, 4l60, Np231 SYE/6 pin planetary/Wide chain, D30 ARB, 8.8 ARB 4.56
c5wagner is offline  
post #8 of 11 Old 10-01-2013, 01:07 PM
c5wagner
Registered User
1989 YJ Wrangler 
 
Join Date: Sep 2013
Location: Highland
Posts: 82
Oh man, I didn't see that you are a fellow californian which means most performance mods you do to the 4.2l are illegal and you won't pass smog unless you know a guy that would fail to notice things

1989 Base YJ TBI 350, 4l60, Np231 SYE/6 pin planetary/Wide chain, D30 ARB, 8.8 ARB 4.56
c5wagner is offline  
post #9 of 11 Old 10-01-2013, 04:51 PM Thread Starter
JeepingShtHpns
Registered User
1988 YJ Wrangler 
 
Join Date: Mar 2013
Location: Canyon Country
Posts: 28
A carb. guy told me it was a good one and some buddies said it gets better gas milage then the others lol even tho he couldn't get it dialed in lol. but i defiantly want to upgrade it when i get the change, working at six flags isn't good with the pay .

I know a few guys too
JeepingShtHpns is offline  
post #10 of 11 Old 10-01-2013, 06:36 PM
c5wagner
Registered User
1989 YJ Wrangler 
 
Join Date: Sep 2013
Location: Highland
Posts: 82
I hear you, but I did my mc 2100 swap for around $65-75: junkyard carb $25, rebuild kit $18, adapter plate $12, and air cleaner $12

1989 Base YJ TBI 350, 4l60, Np231 SYE/6 pin planetary/Wide chain, D30 ARB, 8.8 ARB 4.56
c5wagner is offline  
post #11 of 11 Old 10-06-2013, 12:40 PM Thread Starter
JeepingShtHpns
Registered User
1988 YJ Wrangler 
 
Join Date: Mar 2013
Location: Canyon Country
Posts: 28
Thank guys for all the word of advice and help! I am definitely going to upgrade my Carb. now, i had no idea how much the carter sucks but i guess cause im new to this hahalol And if i need anymore help when i take it apart i"ll be back with more questions.
JeepingShtHpns is offline  
Reply

Tags
4.2 , cylinder , engine , help needed , overhaul

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome