Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

6.2 J code?

Discussion in '1982-Present GM Diesel' started by muddybuddy, Aug 22, 2006.

  1. muddybuddy

    muddybuddy 3/4 ton status

    Joined:
    Jan 29, 2004
    Posts:
    8,933
    Likes Received:
    1
    Location:
    Fairfax Station VA
    whats different about a J code from other 6.2's?
     
  2. 84CUCV

    84CUCV 3/4 ton status Premium Member

    Joined:
    Jul 1, 2002
    Posts:
    7,115
    Likes Received:
    2
    Location:
    NJ for now
    I think there is two. c and j code. c has a round egr thing in the intake not sure how all that works none of my trucks have that. j code witch i think is on all cucvs 6.2s like the ones i have. Does not have the egr. i think it came in 1ton trucks for the most part. someone will please let me know if i am wrong.
     
  3. afroman006

    afroman006 1/2 ton status

    Joined:
    Aug 21, 2002
    Posts:
    2,876
    Likes Received:
    0
    Location:
    College Station & Kingsville, Texas
    Yup. C codes have EGR which recirculates some exhaust gas through the motor to improve emissions and rob power. J codes have none of this crap. As far as I know the intake manifold is the only difference between the two.
     
  4. muddybuddy

    muddybuddy 3/4 ton status

    Joined:
    Jan 29, 2004
    Posts:
    8,933
    Likes Received:
    1
    Location:
    Fairfax Station VA
    oh alright cool. thanks
     
  5. imiceman44

    imiceman44 1 ton status

    Joined:
    Aug 5, 2002
    Posts:
    15,160
    Likes Received:
    1
    Location:
    Sacramento, CA
    I heard that the heads or valve sizes are different too on the J code but I can not confirm.
    I also have seen more variations but have no idea what they are:
    There is a dual plane J code and a single plane J code intake.
    I have also seen a high rise and low rise intake, maybe from the hummer or Van 6.2 l.
     
  6. 84CUCV

    84CUCV 3/4 ton status Premium Member

    Joined:
    Jul 1, 2002
    Posts:
    7,115
    Likes Received:
    2
    Location:
    NJ for now
    ididnt know any of that
     
  7. afroman006

    afroman006 1/2 ton status

    Joined:
    Aug 21, 2002
    Posts:
    2,876
    Likes Received:
    0
    Location:
    College Station & Kingsville, Texas
    There are single and dual plain intakes for J codes. I have been told the single planes are a little mo-betta. There are also "low-rise" intakes but they also have the aircleaner stud holes rotated 90 degrees and yes they are from hummers.
     
  8. colbystephens

    colbystephens 1 ton status GMOTM Winner

    Joined:
    Feb 24, 2005
    Posts:
    10,924
    Likes Received:
    20
    Location:
    Oregon
    i'm pretty sure the j code is only single plane. this and the no-egr is what makes it j code. the j code engines did not have different heads/valves etc.
     
  9. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

    Joined:
    Jul 23, 2000
    Posts:
    36,163
    Likes Received:
    1,360
    Location:
    E-town baby!
    I've seen GM literature specc'ing the 'J' code as having larger valves. My 'J' code intake is 'dual' plane.

    Rene
     
  10. 84CUCV

    84CUCV 3/4 ton status Premium Member

    Joined:
    Jul 1, 2002
    Posts:
    7,115
    Likes Received:
    2
    Location:
    NJ for now
    So what are the cucvs? What is duel plane or single for that matter? thx
     
  11. afroman006

    afroman006 1/2 ton status

    Joined:
    Aug 21, 2002
    Posts:
    2,876
    Likes Received:
    0
    Location:
    College Station & Kingsville, Texas
    Wrong. J codes are most deffinately dual and single plain. I'm prety sure they switched to the single plain in 88 or 89 but not possitive. All CUCV's are J code and every one I've seen has the dual plain.
     
  12. colbystephens

    colbystephens 1 ton status GMOTM Winner

    Joined:
    Feb 24, 2005
    Posts:
    10,924
    Likes Received:
    20
    Location:
    Oregon
    ok, thanks for the info. ;)
     
  13. 84CUCV

    84CUCV 3/4 ton status Premium Member

    Joined:
    Jul 1, 2002
    Posts:
    7,115
    Likes Received:
    2
    Location:
    NJ for now
    thx for the info
     
  14. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

    Joined:
    Jul 23, 2000
    Posts:
    36,163
    Likes Received:
    1,360
    Location:
    E-town baby!
    X2

    Rene
     
  15. rich

    rich 1/2 ton status

    Joined:
    Apr 12, 2000
    Posts:
    279
    Likes Received:
    0
    Location:
    central NC

Share This Page