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Roller Rockers

Discussion in 'The Garage' started by blazerguy 90, Nov 21, 2004.

  1. blazerguy 90

    blazerguy 90 1/2 ton status

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    I was thinking of adding a set of roller rockers to my 90 K5, I know the stock ratio is 1.5, if I went with 1.6 would they work and how much of a gain would I see over the 1.5 rockers ?.
     
  2. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Welcome to CK5.

    Yes they'll work. They'll also put more stress on valve guides and valve springs. The gain with a stock cam will be minimal.
     
  3. beater_k20

    beater_k20 Banned

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    yes, you can use them, but make sure you get the narrow bodied self aligning version, as the standard body rockers will not clear your centerbolt valve covers.
     
  4. 3 on the tree

    3 on the tree 1/2 ton status

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    Not worth the cost and labor unless you are planning on a bigger cam in the future.
     
  5. beater_k20

    beater_k20 Banned

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    what labor? pull 16 nuts, and install them. nothing to it really. plus, reduced friction is your friend.
     
  6. Thunder

    Thunder 3/4 ton status

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    if your engine is stock. Roller rockers are a waste of time and money. You will see very little gains by installing them.
    Maby make a little more torque, thats about it.
    There are a lot better and cheaper ways to make power on a TBI engine than roller rockers.
     
  7. SUBFAN

    SUBFAN 1/2 ton status

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    A '90 motor can have either the self aligning rockers or the regular style. Check it out first in advance.

    I don't think you will even feel a difference for the $200 spent.
     
  8. beater_k20

    beater_k20 Banned

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    [ QUOTE ]
    A '90 motor can have either the self aligning rockers or the regular style.

    [/ QUOTE ]

    no it cant, all centerbolt heads use self aligning rockers.
     
  9. dyeager535

    dyeager535 1 ton status Premium Member

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    Umm, since when?

    AFAIK, Vortecs were the most commonly used heads with self aligning rockers, although there may have been limited usage before that, I seriously doubt trucks before '96 used self aligning stuff.

    I know full well that centerbolt does not=self aligning rockers.
     
  10. SUBFAN

    SUBFAN 1/2 ton status

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    Wanna come and peek under my valve covers then?
     
  11. beater_k20

    beater_k20 Banned

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    all post 86 engines used them. there is nothing special about the "special" rockers that you have to use with Vortec heads, they are the same production pieces that have been used since 1987. they even carry the same part number. i've read the GM parts catalog, no point in arguing this one any further...
     
  12. beater_k20

    beater_k20 Banned

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    have you owned your sub since 1989? its possible that someone thought they'd be cool and replace the rockers at some point with non guided rockers. they will bolt on, but that is not the way they come from the factory.
     
  13. SUBFAN

    SUBFAN 1/2 ton status

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    There are two head castings....One uses the guided rockers, the other one doesn't.

    When I replaced the heads, it had the guided ones installed. After some research, I found the heads I was using required the non-guided rockers /forums/images/graemlins/waytogo.gif
     
  14. jmd

    jmd Registered Member

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    [ QUOTE ]
    There are two head castings....One uses the guided rockers, the other one doesn't.

    When I replaced the heads, it had the guided ones installed. After some research, I found the heads I was using required the non-guided rockers /forums/images/graemlins/waytogo.gif

    [/ QUOTE ]

    I've seen that too. A 1988 305 with pushrod guide slots in the heads and guided rockers. /forums/images/graemlins/dunno.gif GM produced quite a few engines that way around that timeframe.
     

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