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Roller Motors

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by CaptCrunch, Apr 6, 2001.

  1. CaptCrunch

    CaptCrunch 1/2 ton status

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    Been searching and can't seem to find the data... What year did the GM trucks go to roller cams...1987? I know the camaros and ta's first saw them in 86. Anyone know?

    [​IMG]
    1987 Chevy K5 Blazer- 350 TBI
     
  2. jarheadk5

    jarheadk5 1/2 ton status

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    As I understand it, the trucks got hydraulic-roller cams in 87, the same time as the TBI.

    [​IMG] Semper Maintenance!
     
  3. Emmettology 101

    Emmettology 101 3/4 ton status

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    I dont believe the trucks got rollers until the early 90's(92-94??)

    Just because it has the Center bolt valve covers, doesn't mean it is a roller engine!

    I dont believe my '90 350 has rollers, at least the rockers and lifter aren't....

    But I am almost positive thatsomeone said before that the trucks got them after '92 sometime... Maybe when the Vortec came out in '95..

    Mike - <A target="_blank" HREF=http://emmett.coloradok5.com>http://emmett.coloradok5.com</A>[​IMG]
     
  4. CaptCrunch

    CaptCrunch 1/2 ton status

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    yeah that's what I thought...thanks

    [​IMG]
    1987 Chevy K5 Blazer- 350 TBI
     
  5. HarryH3

    HarryH3 1 ton status Author

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    The GM factory service manuals for both '87 and '94 show flat tappet lifters for the 350. [​IMG] My '87 Corvette 350 had roller lifters. The 4.3L in my '91 S-Jimmy has rollers. Who knows what GM was thinking?

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
    It's a great day to be alive...
     
  6. Pure Insanity

    Pure Insanity 1/2 ton status

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    my vortec has em.already bought the cam before i scrored the motor so now it has flat tappet in it ill prob change that out w/in a year or so.to go back to roller.it just seems like a shame to have a roller set up and not use it.my sig says vortec heads but its actually a whole vortec motor,w/out the injection,and a new cam.

    PURE INSANITY
    86 blazer silverado 400 horse 350 w/vortec heads 38 x15.5 swampers (40 hawgs next)10 bolts(blah)w/4:88s coming soon,14 bolt.
     
  7. ken

    ken 1/2 ton status

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    I just pulled the stock engine out of my '90 Suburban. 2 bolt main, non-roller cam. A basic car motor. In its place went a 4 bolt roller cam block, with Corvette roller cam, a forged crank from a 2 ton truck (no truck under one ton OR ANY cars came with forged cranks), and the vortec heads. Guess what? No power difference!! Just going to a roller cam is not that big of a HP difference.

    ken
     

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