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Will G body headers fit on a 73-87 Jimmy??

Discussion in 'The Garage' started by chevyguybc, Feb 10, 2006.

  1. chevyguybc

    chevyguybc 1/2 ton status

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    hey i have a exhaust system with h pipe for headers, but the truck only has one header, however i have headers on my malibu.. will they fit

    flowtech
     
  2. Russell

    Russell LB7 Tahoe Status Premium Member GMOTM Winner

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    If you mean 3/4 length chevelle style headers, then yep, they fit!

    Infact, if I had the choice, I'd ditch my long tubes in favour of a set of 3/4 length headers any day. Gives a guy a far better exit position for routing exhaust on a 4x4...
     
  3. big dan

    big dan 1/2 ton status Premium Member

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    does anybody have any pics of this? im interested too because i dont like where my headers exit and i would like to see where they exit. they hang low and the clearance between the driveshaft header and shackle is really scary.
     
  4. Russell

    Russell LB7 Tahoe Status Premium Member GMOTM Winner

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    Most of them end at about a 45 degree angle downwards from the back of the engine, around the same level as the bottom bellhousing bolts. (similar to a pass side manifold exit, except a bit lower)

    Allows you to run pipes close to the floor above the frame rails, which big time helps front driveshaft / spring shackle to exhaust clearance issues, and also takes just one more thing that you can get hung up on out of the equation.
     
  5. chevyguybc

    chevyguybc 1/2 ton status

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    right on, sounds like i may slap them on.. but ive got this h pipe setup that was on a buddies truck, but he had the regular truck headers on, hopefully it will fits its just tucked up higher
     
  6. jays68yak

    jays68yak 1/2 ton status

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    heres some pics of a 3/4 A body headers on my 454 in my 79 blazer.
    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]
     
  7. Sandman

    Sandman 3/4 ton status Author

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    When I pulled the 454 out of my '71 SS Chevelle and dropped it in my Blazer, the headers went with it. I had to grind the motor mount on the drivers side a little bit and slightly notch the frame on the passenger side. I tried a set of truck headers first and ditched them pretty fast. They hung down real low and the driveline rubbed on the header flange. The Chevelle headers worked great and are way high above everything.
     
  8. spoolnaround

    spoolnaround 1/2 ton status

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    Good thread! I just happen to have a set of Cyclone Super Comp headers from a 64 Chevelle rusting away in the back yard. I will most likely have to shorten up the collectors a little but that would be great if they fit. Correct me if I am wrong but long collectors are for high RPM's correct? Shorter collectors will help bottem end?
     
  9. Russell

    Russell LB7 Tahoe Status Premium Member GMOTM Winner

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    Correct, freer exhaust provides better top end, more restrictive exhaust (to an extent) will help with low end torque.
     
  10. dyeager535

    dyeager535 1 ton status Premium Member

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    "A basic rule on collectors is that shorter, larger diameters favor top end while longer, smaller diameters favor the low end."

    More than I guarantee you ever want to know about exhaust

    http://superchevy.com/technical/engines_drivetrain/exhaust/0505phr_exh/
     
  11. 3 on the tree

    3 on the tree 1/2 ton status

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    Let me see if I remember this right; Paint the collector and run the engine for bout an hour. Where thepaint stopped burning is where to cut the collector. If the paint burns all the way to the flange, need a longer collector. Used to do this for flat trackers. Think I read it in a Hot Rod mag back in the day.
     
  12. chevyguybc

    chevyguybc 1/2 ton status

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    well i ended up geting some hooker comps truck headers, with equal lenght and ****, no collectors so ill do what ive done before, and get the shop to weld it directly to the pipe, that way no collector to replace:D:D:D
     
  13. ryanstrucking

    ryanstrucking 1/2 ton status GMOTM Winner

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    What type of headers are those? Do you have a part #?
    Those look like they'd work in my application as well.
    Regards
    RYan
     
  14. bayou blazer

    bayou blazer 1/2 ton status

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    I am interested as well, thanks
     

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