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camshafts

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by KASS, Mar 19, 2001.

  1. KASS

    KASS Registered Member

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    With this '88 Blazer I have a stock 350. I would like to do a top end rebuild because of smoke on start up and oil consumption. With all the "towing" camshafts availiable what would be recommended? And would the TBI or any other component have to be altered to accept a different cam?
     
  2. Triaged

    Triaged 1/2 ton status

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    I think that you have the hydrolic roller cam. Replacement cams for these are around $240 without lifters. Comp Cams and Crane Cams make stuff designed for your engine. Give both a call and ask which one to use.

    '71 Blazer CST with alot of rust
     
  3. HarryH3

    HarryH3 1 ton status Author

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    An '88 won't have a factory roller cam. (Unless it's a 6.2L diesel). The 350's used a flat tappet cam. [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     
  4. Andreas

    Andreas 1/2 ton status

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    If you got smoke on startup, a top end rebuild won´t solve it I´m afraid [​IMG]. Smoke on startup usually indicates worn valvestem seals. If it´s smoking all the time you need to hone (and possibly bore) the cylinders and get new rings.

    /Andreas

    406cui of pure sh*t[​IMG]
    <A target="_blank" HREF=http://hem.passagen.se/znus/>http://hem.passagen.se/znus/</A>
     
  5. Triaged

    Triaged 1/2 ton status

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    I thought they changed in '87 (when they went to a 1-piece rear main seal). What year did they change?

    '71 Blazer CST with alot of rust
     
  6. Bigd

    Bigd 1/2 ton status

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    What ever kind of cam you have make sure that its one designed for a motor with TBI.
     
  7. Blue85

    Blue85 Troll Premium Member

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    I think roller cams came in on the Vortec's

    <font color=green>Stupid tourist at Mammoth Cave, Kentucky: "How many miles of unexplored passages are there?"</font color=green>
     
  8. Derf00

    Derf00 1/2 ton status

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    I just replace my intake and cam on my '90 Jimmy. The cam is a flat tappet cam. I used the Edlebrock intake and cam combo. The cam is a very mild and does a good job of low end torque and really improved the power throught the entire range. The cam and intake are designed to work on a TBI engine without changing the chip.

    Derf00
    http://www.derf00.coloradok5.com
     
  9. jarheadk5

    jarheadk5 1/2 ton status

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    My '87 TBI 305 has a roller cam, according to Crane Cams. That's why a new cam for my truck is so much more than normal.

    [​IMG] Semper Maintenance!
     
  10. HarryH3

    HarryH3 1 ton status Author

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    They put roller cams in the 'vette engine starting in '87. But the trucks kept the flat tappet cams. At least that's what the GM factory service manual shows. The 4.3 V6 got a roller, but the 350 didn't. Even the factory service manual for my '94 Suburban says it has a flat tappet cam. [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     
  11. Emmettology 101

    Emmettology 101 3/4 ton status

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    Smoke at start up is usually caused by bad valve seals. These seal only cost about $10 and can be changed with some tools and air pressure.

    Mike [​IMG]
    See <font color=green>EMMETT</font color=green> -&gt; <A target="_blank" HREF=http://emmett.coloradok5.com>http://emmett.coloradok5.com</A>
     
  12. Brians 60s

    Brians 60s 1/2 ton status

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    Kass, HHmmm isn't that the name of the first member of the mamas and the papas that died in 1974?

    "IF YOU'VE NEVER BEEN STUCK.....YOU'VE NEVER BEEN WHEELIN"!!!
     

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