L37, ld8, l47 & lx5
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 5 of 5
Northstar Engines and System Technical Discussion Discussion, L37, ld8, l47 & lx5 in Cadillac Engine Technical Discussion; Just had a couple of questions about the 3 Northstar v8's. Tried looking for this information on the search bar ...
  1. #1
    Cadillackostab is offline Cadillac Owners Member
    Automobile(s): 2003 Cadillac DTS & 1993 Sedan DeVille
    Join Date
    Aug 2011
    Location
    Hampton, NH
    Posts
    16

    L37, ld8, l47 & lx5

    Just had a couple of questions about the 3 Northstar v8's. Tried looking for this information on the search bar but could find nothing.

    In The 1996-99 Northstar L37 & LD8 basically the same besides the difference between the camshafts. (internals, head flow, Block strength, Valves & Springs ect).

    In The 96-99 L37 4.6l & l47 4.0l Are those basically the same besides the camshafts & that the 4.0l is a smaller bore. (Internals, head flow, Valves & Springs, block strength)

    Is It possible to swap the l37 cams & valve springs into the l47 4.0l engine & also would it be possible to put a l37 heads on a l47? Is it possible because of the bores are different.


    I've heard that with a L37 cam swap in a l47 4.0L hp will go from factor 250hp to around 320hp?


    I just really wanted to know if any of the v8 Northstar parts can be swapped.


    And last but not least for the 3.5l lx5 have you guys heard of anything crazy like adding a turbo or sc to it to make more hp or even. Or even bumpin up the compression ratio since its only 9.3:1. Are the internals forged just like the other northstars if anyone has any links to learn more about the internals of the northstar i'd appreciate it.

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS/65500mi, 2004 Ford F150 SuperCab4x4
    Join Date
    Feb 2006
    Location
    MD Eastern Shore - Kent Island
    Age
    74
    Posts
    41,525

    Re: L37, ld8, l47 & lx5

    Quote Originally Posted by Cadillackostab View Post
    Just had a couple of questions about the 3 Northstar v8's. Tried looking for this information on the search bar but could find nothing.
    In The 1996-99 Northstar L37 & LD8 basically the same besides the difference between the camshafts. (internals, head flow, Block strength, Valves & Springs ect).
    In The 96-99 L37 4.6l & l47 4.0l Are those basically the same besides the camshafts & that the 4.0l is a smaller bore. (Internals, head flow, Valves & Springs, block strength)
    Is It possible to swap the l37 cams & valve springs into the l47 4.0l engine & also would it be possible to put a l37 heads on a l47? Is it possible because of the bores are different.
    I've heard that with a L37 cam swap in a l47 4.0L hp will go from factor 250hp to around 320hp? (1)

    I just really wanted to know if any of the v8 Northstar parts can be swapped. (2)
    And last but not least for the 3.5l lx5 have you guys heard of anything crazy like adding a turbo or sc to it to make more hp or even. Or even bumpin up the compression ratio since its only 9.3:1. Are the internals forged just like the other northstars (3) if anyone has any links to learn more about the internals of the northstar i'd appreciate it.
    1996 - 1999 L37 and LD8 are basically the same.

    (1) You heard wrong.

    (2) Couple of glitches here - pre-1996 engines are pretty much the same. 1997 saw some changes, 1998/9 saw more, and 2000 > was a total redesign. When swapping parts try to stay within the same year groups. There's a compatibility thread (sticky) concerning differences at the top of the Northstar engine Forum.

    (3) The 4.6 engine crankshaft is not forged. (Cast nodular iron). The rods are forged/cracked cap units. Internals: see (2).

  4. #3
    Cadillackostab is offline Cadillac Owners Member
    Automobile(s): 2003 Cadillac DTS & 1993 Sedan DeVille
    Join Date
    Aug 2011
    Location
    Hampton, NH
    Posts
    16

    Re: L37, ld8, l47 & lx5

    Darn too bad you can't change many parts onto the diffrent engine's like the l37 to l47. And has anyone heard of doing anything crazy with the lx5 its running 9.3:1 with only 215hp i wounder what would happen if u bumped it up to 10:1

  5. #4
    89falcon is offline Cadillac Owners Fanatic
    Automobile(s): my wife crazy, 1997 STS, 2004 CTS
    Join Date
    Apr 2011
    Posts
    207

    Re: L37, ld8, l47 & lx5

    Quote Originally Posted by Cadillackostab View Post
    Darn too bad you can't change many parts onto the diffrent engine's like the l37 to l47. And has anyone heard of doing anything crazy with the lx5 its running 9.3:1 with only 215hp i wounder what would happen if u bumped it up to 10:1
    Actually, IIRC, you CAN interchange parts between an L37 and L47 if they are the same year model............but why would you...they use the same cams.

  6. #5
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS/65500mi, 2004 Ford F150 SuperCab4x4
    Join Date
    Feb 2006
    Location
    MD Eastern Shore - Kent Island
    Age
    74
    Posts
    41,525

    Re: L37, ld8, l47 & lx5

    Play with compression changes and you also have to play with PCM reprogramming - fuel curves, timing curves, knock sensor operation. (and try to find pistons - the quench areas in the pent-roof chamber already prevent milling the head.)

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