For you guys who have done a headgasket job on the 4.6
Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds / (Old System)

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

CadillacForums.com is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Results 1 to 3 of 3
Northstar Engines and System Technical Discussion Discussion, For you guys who have done a headgasket job on the 4.6 in Cadillac Engine Technical Discussion; Guys, I have a few questions concerning a headgasket job on a 99 sts with a 4.6 northstar. 1. Should ...
  1. #1
    danssts is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Nov 2006
    Posts
    52

    For you guys who have done a headgasket job on the 4.6

    Guys, I have a few questions concerning a headgasket job on a 99 sts with a 4.6 northstar.
    1. Should the heads be milled down and the block be decked or is this a waste of time. Also I assume the cams would have to be removed for the machine shop to complete the job, correct?
    2. I removed the rear head today and looked at the head gasket but did not notice anything really bad...Should there not be some clear reason for the antifreeze to get into the cylinders?
    3. When I pulled the head bolts out it pulled some of the threads out with it. Is this a sign that they needed to be replaced?
    4. What is the difference between the "Bigsert kit" and the regular one??
    Thanks,
    Dan

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    white97deville is offline Cadillac Owners Member
    Automobile(s): '97 Deville
    Join Date
    Mar 2005
    Location
    Dallas, TX
    Posts
    81

    Re: For you guys who have done a headgasket job on the 4.6

    1. Most heads don't need machining. Did mine without and no problems. Use a straight edge and feeler gauge to check for flatness. Yes, if you had the heads machined you would have to remove the camshafts.
    2. Examine your gasket carefully to find the leak passage from the water jacket to the cylinder. The piston with the leaky gasket around it will be clean while the others will have some carbon buildup.
    3. This is why you need to Timesert your block when you remove the heads.
    4. Bigsert is an oversized Timesert for blocks that have already had Timeserts installed. If you are on the first headgasket job on your Nstar you will need the regular timeserts.

  4. #3
    danssts is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Nov 2006
    Posts
    52

    Re: For you guys who have done a headgasket job on the 4.6

    Perfect man, very helpful.
    -Dan

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.
If you do not want to register, fill this field only and the name will be used as user name for your post.

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

Please enter a valid email address for yourself.

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.



Bookmarks

Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
Read about Lincoln | Buick | Kia Forte Forum
Need products for your Cadillac? Check out your options at the links below:

custom floor mats | Cadillac Chrome and Black Chrome Wheels | window tinting