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Thread: Northstar Cam specs

  1. #1
    AJxtcman's Avatar
    AJxtcman is offline Cadillac Owners Connoisseur
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    Northstar Cam specs

    Cadillac specs


    1993 - 1998 Cadillac (LD8 (VIN Y )
    • Valve Timing (With Ramp at 0.100 mm Lift)
    • Intake Opens 9 degrees BTDC
    • Intake Closes 55 degrees ABDC
    • Exhaust Opens 51 degrees BBDC
    • Exhaust Closes 13 degrees ATDC

    • Valve Lift
    • Intake 8.6 mm 0.339 in
    • Exhaust 8.6 mm 0.339 in

    • Duration (@ 0.100 mm Lift)
    • Intake 244 degrees
    • Exhaust 244 degrees

    • Valve Overlap (@ 0.100 mm Lift) 22 degrees

    .

    1993 - 1999 Cadillac (L37 (VIN 9)
    • Valve Timing (With Ramp at 0.100 mm Lift)
    • Intake Opens 13 degrees BTDC
    • Intake Closes 73 degrees ABDC
    • Exhaust Opens 51 degrees BBDC
    • Exhaust Closes 13 degrees ATDC

    • Valve Lift
    • Intake 9.4 mm 0.370 in
    • Exhaust 8.6 mm 0.339 in

    • Duration (@ 0.100 mm Lift)
    • Intake 266 degrees
    • Exhaust 244 degrees

    • Valve Overlap (@ 0.100 mm Lift) 26 degrees

    .

    1999 Cadillac (LD8 (VIN Y )
    • Valve Timing (With Ramp at 0.100 mm Lift)
    • Intake Opens 8 degrees BTDC
    • Intake Closes 55 degrees ABDC
    • Exhaust Opens 51 degrees BBDC
    • Exhaust Closes 13 degrees ATDC

    • Valve Lift• Intake 8.6 mm 0.339 in
    • Exhaust 8.6 mm 0.339 in

    • Duration (@ 0.100 mm Lift)
    • Intake 243 degrees
    • Exhaust 244 degrees

    • Valve Overlap (@ 0.100 mm Lift) 22 degrees

    .

    2000 - 2003 Cadillac (LD8) 1.68 Rockers
    • Camshaft Lobe Duration @ 0.150 mm (0.006 in) Lift - Exhaust 236 degrees
    • Camshaft Lobe Duration @ 0.150 mm (0.006 in) Lift - Intake 242 degrees
    • Camshaft Lobe Lift - Exhaust 5.94 mm 0.2339 in
    • Camshaft Lobe Lift - Intake 6.15 mm 0.2421 in

    • Camshaft Lobe Overlap @ 0.150 mm (0.006 in) Lift 1.98 degrees

    • Camshaft Timing @ 0.150 mm (0.006 in) Lift
    • Intake Opens 5.6 degrees BTDC
    • Intake Centerline 113.0 degrees ATDC
    • Intake Closes 236.8 degrees ATDC
    • Exhaust Opens 222.5 degrees BTDC
    • Exhaust Centerline 107.0 degrees BTDC
    • Exhaust Closes 13.8 degrees ATDC

    .

    2000 - 2003 Cadillac (L37) 1.68 Rockers
    • Camshaft Lobe Duration @ 0.150 mm (0.006 in) Lift - Exhaust 246 degrees
    • Camshaft Lobe Duration @ 0.150 mm (0.006 in) Lift - Intake 251 degrees
    • Camshaft Lobe Lift - Exhaust 5.94 mm 0.2339 in
    • Camshaft Lobe Lift - Intake 6.15 mm 0.2421 in

    • Camshaft Lobe Overlap @ 0.150 mm (0.006 in) Lift 2.04 degrees

    • Camshaft Timing @ 0.150 mm (0.006 in) Lift
    • Intake Opens 0.0 degrees ATDC
    • Intake Centerline 122.0 degrees ATDC
    • Intake Closes 251.0 degrees ATDC
    • Exhaust Opens 225.5 degrees BTDC
    • Exhaust Centerline 106.0 degrees BTDC
    • Exhaust Closes 20.5 degrees ATDC
    .


    2004 - 2008 Cadillac (LD8) 1.68 Rockers
    • Camshaft Lobe Duration @ 0.150 mm (0.006 in) Lift - Exhaust 236 degrees
    • Camshaft Lobe Duration @ 0.150 mm (0.006 in) Lift - Intake 242 degrees
    • Camshaft Lobe Lift - Exhaust 5.94 mm 0.2339 in
    • Camshaft Lobe Lift - Intake 6.15 mm 0.2421 in

    • Camshaft Lobe Overlap @ 0.150 mm (0.006 in) Lift 1.98 degrees

    • Camshaft Timing @ 0.150 mm (0.006 in) Lift
    • Intake Opens 1.3 degrees BTDC
    • Intake Centerline 117.0 degrees ATDC
    • Intake Closes 237.9 degrees ATDC
    • Exhaust Opens 226.1 degrees BTDC
    • Exhaust Centerline 111.0 degrees BTDC
    • Exhaust Closes 5.1 degrees ATDC

    .

    2004 - 2008 Cadillac (L37) 1.68 Rockers
    • Camshaft Lobe Duration @ 0.150 mm (0.006 in) Lift - Exhaust 246 degrees
    • Camshaft Lobe Duration @ 0.150 mm (0.006 in) Lift - Intake 251 degrees
    • Camshaft Lobe Lift - Exhaust 5.94 mm 0.2339 in
    • Camshaft Lobe Lift - Intake 6.15 mm 0.2421 in

    • Camshaft Lobe Overlap @ 0.150 mm (0.006 in) Lift 2.04 degrees

    • Camshaft Timing @ 0.150 mm (0.006 in) Lift
    • Intake Opens 0.3 degrees ATDC
    • Intake Centerline 122.0 degrees ATDC
    • Intake Closes 246.0 degrees ATDC
    • Exhaust Opens 229.3 degrees BTDC
    • Exhaust Centerline 110.0 degrees BTDC
    • Exhaust Closes 11.2 degrees ATDC

    Last edited by AJxtcman; 11-11-07 at 06:07 PM.

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  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Northstar Cam specs

    AJ..........Thanks for the specs. Good reference for the bumpstick loonies.....

    Given the intake opening and closing events, the above explains why the 2002 "Y" LD8 engine has sort of an RV midrange torque curve and the "9" L37 is more of a higher RPM tune. ..........and you don't need as much total lift to flow 4 valves instead of 2, and 1.68 is a fairly aggressive follower (rocker) ratio.

  4. #3
    AJxtcman's Avatar
    AJxtcman is offline Cadillac Owners Connoisseur
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    Re: Northstar Cam specs

    I had the 03 cams spec listed different. I am looking for that info.

  5. #4
    Cadillacboy's Avatar
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    Re: Northstar Cam specs

    Great info ,thanks for that

  6. #5
    AJxtcman's Avatar
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    Re: Northstar Cam specs


  7. #6
    codewize's Avatar
    codewize is offline Cadillac Owners Master
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    Re: Northstar Cam specs

    Interesting. The duration is very different, explaining the torque diff of course.

    Great info, Points Well I tried but it won't let me.
    Ownership:
    91 Brougham d'Elegance 350
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    ----------------------------

  8. #7
    AJxtcman's Avatar
    AJxtcman is offline Cadillac Owners Connoisseur
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    Re: Northstar Cam specs

    This lead me to believe that 2003 has the best cams. I will dig around to find the other specs. GM has changed them in SI. It shows 00 to 03 all the same.

    LD8 ------2000-01--------2002 -------2003 - 05
    RH INT--------12572155---------- 12570333---------12565167

    LH INT--------12572152---------- 12570332---------12565169

    RH EXH ------ 12572154---------- 12570331---------12565165

    LH EXH ------ 12572153-----------12570334---------12565166


    L37
    RH INT--------12572159-----------12570335 ---------12568828

    LH INT--------12572156-----------12570336 ---------12565170

    RH EXH-------12572158-----------12570337 ---------12568826

    LH EXH-------12572157-----------12570338 ---------12568827


    The 2002 Cams are the ones listed in the TSB for 2000 and 2001

  9. #8
    codewize's Avatar
    codewize is offline Cadillac Owners Master
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    Re: Northstar Cam specs

    So you're telling me that since my 01 was produced after the cam issue with engine code KBB, that my cams are the same as an 02?
    Ownership:
    91 Brougham d'Elegance 350
    95 Fleetwood Brougham
    01 Custom Deville DTS
    2011 CTS4 Luxury

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    Proud Volunteer - Northstar Tuning Project
    Guinness World Records - Largest Cadillac Parade

    ----------------------------

  10. #9
    AJxtcman's Avatar
    AJxtcman is offline Cadillac Owners Connoisseur
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    Re: Northstar Cam specs

    I am at a loss for words.
    I have been checking broadcast codes.
    I have no clue on what they did. I will post a list later. I am confused on my findings.

  11. #10
    nigelb's Avatar
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    Re: Northstar Cam specs

    so does your post about the rough idle mean that my '00 STS should have new cams?
    it has the code JLA on the cam cover and is a 10th digit 'Y' car.
    of course, who would foot the bill for all this?
    the specs in my FSM are the same as listed above.
    Last edited by nigelb; 01-03-08 at 05:53 PM.

  12. #11
    AJxtcman's Avatar
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    Re: Northstar Cam specs

    Instruction sheet for engine replacement

    When using LD8 Engine part #88984255 to replace Broadcast code KHA the dealer must get a VCI

    When using LD8 Engine Part #88984254 to replace Broadcast code KMA or KPA the dealer must get a VCI

    When using L39 engine part #88984253 to replace broadcast code KKA or KLA the dealer must get a VCI

  13. #12
    AJxtcman's Avatar
    AJxtcman is offline Cadillac Owners Connoisseur
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    Re: Northstar Cam specs

    We know that they used KMA, KKA, KCA, and KBA in 01

    I need to do a lot more searching, but this is odd

    LD8 VIN (Y)
    00 ---
    01 KMB
    02 JMA runs from 7/01 to 6/02
    03 KMA starting in 6/02. They ran this in 01 hmmmm
    03 KMB started in 5/03. They ran this in 01

    L37
    00 ---
    01 ---
    02 JLA 3/01
    02 JKA 7/01 to 6/02
    03 KKA 6/02 to ??
    03 KKb 5/03 to ??

    I have not finished my list, but WTF

    I did not look at eldo's yet

  14. #13
    AJxtcman's Avatar
    AJxtcman is offline Cadillac Owners Connoisseur
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    Re: Northstar Cam specs

    ranger I will figure this out, but I am not sure if they had old engines sitting around that they swapped cams in. Oh wait they don't do that they would just scrap them. Hmmmmmmmmmmmm

  15. #14
    darien99's Avatar
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    Re: Northstar Cam specs

    Quote Originally Posted by AJxtcman View Post
    This lead me to believe that 2003 has the best cams.
    Best as in smoothness?
    From my little cam reading knowledge it looks like the '93-'95 has the best cams for power.

  16. #15
    AJxtcman's Avatar
    AJxtcman is offline Cadillac Owners Connoisseur
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    Re: Northstar Cam specs

    Quote Originally Posted by darien99 View Post
    Best as in smoothness?
    From my little cam reading knowledge it looks like the '93-'95 has the best cams for power.
    For 00+

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