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.

Single plain J-code 6.2L intake?

Discussion in '1982-Present GM Diesel' started by afroman006, Sep 13, 2004.

  1. afroman006

    afroman006 1/2 ton status

    Joined:
    Aug 21, 2002
    Posts:
    2,876
    Likes Received:
    0
    Location:
    College Station & Kingsville, Texas
    All the J-code 6.2L intakes I've seen and sold off of CUCV's were all duel plain but I just bought a single plain intake off of e-bay. The seller said it came from a military hummer and is a j-code. Whats the deal? I know with gas engines single and dual plain intakes have different performance characteristics, I assume its the same with diesels? What kind of performance can I expect from this manifold? Thx
     
  2. AgDieseler

    AgDieseler Certified Scrap Producer Premium Member GMOTM Winner

    Joined:
    Jan 25, 2001
    Posts:
    1,040
    Likes Received:
    1,108
    Location:
    Dallas
    There are three different single plane manifolds available.

    1) 1988-1992 6.2L single plane J - has a raised center section with a single CDR port on the passenger side. Stud orientation is 12 & 6.

    2) 1993-2000 6.5TD single plane F - has a raised center section with no CDR ports. Provision for 6 mounting bolts; no studs.

    3) 198?-199? 6.2L/6.5L NA single plane Hummer intake - has a flush center section with a single CDR port on the passenger side. Stud orientation is 3 & 9. ***This is what you probably have***

    All three are excellent, and you can expect better performance from your single plane than a dual plane. There's a big hole in the center with runners going out from it. I have one, and will probably work it into my future plans.

    Here's a pic of a Hummer intake:
    http://www.oliverdiesel.com/inventory/hummerintake.JPG
     
  3. afroman006

    afroman006 1/2 ton status

    Joined:
    Aug 21, 2002
    Posts:
    2,876
    Likes Received:
    0
    Location:
    College Station & Kingsville, Texas
    Ok cool. Mine doesnt have a center divider, just a big open hole like yours. BTW, what is CDR?
     
  4. zcarczar

    zcarczar 1/2 ton status

    Joined:
    Feb 10, 2002
    Posts:
    2,495
    Likes Received:
    0
    Location:
    Apple Valley California
    Its a Valve, CDR stands for crankcase depression regulation valve.
     
  5. AgDieseler

    AgDieseler Certified Scrap Producer Premium Member GMOTM Winner

    Joined:
    Jan 25, 2001
    Posts:
    1,040
    Likes Received:
    1,108
    Location:
    Dallas
    It's the goldish "tuna can" located either just above the alternator on early 6.2L engines, or on the passenger side valve cover on later 6.2L and all 6.5L.
     
  6. Pookster

    Pookster 1/2 ton status

    Joined:
    Nov 21, 2000
    Posts:
    3,195
    Likes Received:
    0
    Location:
    NYC, NY, USA
    Doh. This is certainly gonna make putting on an air intake fun!
     

Share This Page