4.0 head on 4.2 block. - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 08-09-2013, 11:28 AM   #1
Jeeper
 
1987Wrangler YJ's Avatar
 
Join Date: Jun 2013
Posts: 567
4.0 head on 4.2 block.

Sup yall. I have been wanting to do this for some time now. I finally got my weber carb and want to start gathering parts. Can I use my stock intake/ manifolds? will the thermostat cover fit on the new head? can I use either a 4.0/4.2 head gasket? is doing all this even worth it?

1987Wrangler YJ is offline   Quote Quick Reply
Old 08-09-2013, 02:19 PM   #2
Jeeper
 
Join Date: Apr 2012
Posts: 840
heres a thread that explains it. personally I wouldn't do it unless I was going all the way with FI but a lot of people do it and like it. I believe you can improve on the 4.2 head by cleaning up the casting in the ports, port matching it and shaving 10tho off it to up compression.

Jeep Strokers • 4.0 head and EFI on a 4.2
block


and here
http://offroad-review.com/new/index.php?page=68

roadyrob is online now   Quote Quick Reply
Old 08-09-2013, 10:10 PM   #3
Jeeper
 
1987Wrangler YJ's Avatar
 
Join Date: Jun 2013
Posts: 567
My truck has the retarded plastic valve cover. I was hoping to ditch that. would getting the 88-90 head with the alloy one, then getting that rebuilt be a good idea? my jeep only has 50k miles. I still want to get a head redone for some better hp and compression
1987Wrangler YJ is offline   Quote Quick Reply
Old 08-10-2013, 05:55 AM   #4
Jeeper
 
Join Date: Apr 2012
Posts: 840
from what I've read your head can be drilled and tapped for the alum. valve cover.
or you can pick up a used one, get it ready and save down time. when you have a machine shop do the valves have them shave 10 thousands off the deck.
look into the ports, you will see a casting ridge that should be removed with a die grinder, then port match it to the intake manifold. there are videos on youtube that show how to do it.
roadyrob is online now   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

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.



Thread Tools

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 Off
Refbacks are Off




» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 09:36 AM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC