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Pullies on a 1986 Blazer/Jimmy

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by sandracer799, Feb 10, 2004.

  1. sandracer799

    sandracer799 1/2 ton status

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    Did the 86 blazer/ jimmy come with the semi serpentine set-up? Also has anyone ever used the semi serpentine set-up that has A/C on a engine with Vortec Heads. If so did you have to make any mods to it.
    Thanks in advance
    Josh
     
  2. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    87' was the first year for a semi serpintine setup. Far as I know 86 and earlier still had all v-belts. My 85' has v-belts.
     
  3. moneypit

    moneypit 1/2 ton status

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    My 86 is semi-serp. /forums/images/graemlins/thumb.gif
     
  4. beater_k20

    beater_k20 Banned

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    mine is semi serp too
     
  5. tarussell

    tarussell 1/2 ton status

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    My 1986 K-5 came with a multi-groove belt for the alt. and regular V-belts for the P/S and A/C and they are the same pulleys that are on a 1987 T.B.I. parts Blazer that I had .
     
  6. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    I guess 86' was the first year for some sort of serpintine setup, not 87'. /forums/images/graemlins/doah.gif
     
  7. 83ZZ502_Jimmy

    83ZZ502_Jimmy 1/2 ton status

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    Where in VA are you? Nice to see another VA member. /forums/images/graemlins/wink.gif

    And yes, 1986 is the 1st year for the semi serp setup.

    John
     
  8. dyeager535

    dyeager535 1 ton status Premium Member

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    Vortec heads shouldn't make any difference for the pulleys, they have the same accessory holes as all earlier heads. (3 per end of head)

    Semi-Serpentine I *think* first started in 1985 on the Monte Carlo's with the 305, and is what I've got on my truck with Vortec heads, but I don't have AC. Compressor is DS right? Even with semi-serpentine I believe the AC is run off of a v-belt.

    On my setup, serpentine runs water pump and alternator, V to the PS pump.

    you can see the two "empty" water pump V-belt grooves
     
  9. 83ZZ502_Jimmy

    83ZZ502_Jimmy 1/2 ton status

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    When he says pullies, I think he is referring to how the brackets bolt to the intake manifold and heads. Since the vortec intake is 8 bolts straight down instead of the 12 on an angle, it may make the brackets difficult to bolt-on.

    I know on one particular motor that I converted to Vortec, I could not reuse the existing brackets/pullies for this exact reason. Too much relied on the intake for support.

    John
     
  10. dyeager535

    dyeager535 1 ton status Premium Member

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    Very bizarre...none of the other replies showed up until yours did.

    Ahh, brackets to intake manifold, yeah I can see this being a problem. AC has one that goes to the intake, correct?

    TPI threw me a whole 'nother problem, but it too was bracket related.

    Can perhaps a '96+ truck AC setup work, or did the AC system change enough by then that the brackets won't work? (besides being full serpentine I'm sure)
     
  11. 83ZZ502_Jimmy

    83ZZ502_Jimmy 1/2 ton status

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    Yes the A/C does go to the intake.

    A 96 Setup could/might work, but then, the A/C compressor is different. If his A/C is working now, he would have to do a full evacuate and recharge to convert to the newer compressor. Plus then the lines may not work.

    It could get expensive quickly.

    John
     
  12. dyeager535

    dyeager535 1 ton status Premium Member

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    So, yet another reason Vortec heads suck compared to Pro-Toplines or anyone elses. /forums/images/graemlins/smile.gif

    There HAS to be a decent fix for this though realistically, Vortec heads have gained so much popularity to retrofit, people still must want AC...
     
  13. 83ZZ502_Jimmy

    83ZZ502_Jimmy 1/2 ton status

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    There has to be a way. Maybe through some creative bending or some new supports/brackets to use as bracing like original.

    GM does have a fix for the problem however. Their solution is to offer a serpentine conversion kit. With and without A/C. This kit comes with everything including the water pump, alt, ps, and AC. But to the tune of 750 bucks. /forums/images/graemlins/yikes.gif /forums/images/graemlins/smile.gif

    So we shall see if it can be made to work...

    John
     
  14. dyeager535

    dyeager535 1 ton status Premium Member

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    The problem, as I found out with the '88 coil/EGR solenoid bracket I have, is that even if you can bend the brackets to the right angle, the bolts are a different distance apart. /forums/images/graemlins/mad.gif

    IIRC, it was at just such a distance that the bracket I had wasn't long enough, so I couldn't elongate the hole.

    A new bracket shouldn't be that difficult to come up with, perhaps on Vortec carbed intakes they have thought to cast in a few drilled/tapped holes for this idea?
     
  15. 83ZZ502_Jimmy

    83ZZ502_Jimmy 1/2 ton status

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    On the edelbrock carb'd intake I used on a previous project, it did not have any provisions for such a problem. Maybe the GM one will have an area cast and tapped for that.

    John
     
  16. sandracer799

    sandracer799 1/2 ton status

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    Thanks for all the help guys i will try all of your suggestions and see what happens. /forums/images/graemlins/thumb.gif
    Josh
     
  17. dyeager535

    dyeager535 1 ton status Premium Member

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    You already have the heads or?

    If not, I'd highly suggest against them, IMHO.
     

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