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89 TBI 350 - self-aligning rocker arms?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 89GMCSuburban, Jun 20, 2002.

  1. 89GMCSuburban

    89GMCSuburban 1/2 ton status

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    Does an 89 TBI truck motor use self-aligning rocker arms? I know my motor still has the old style intake manifold bolt setup. I've been looking into some 1.6 roller rockers and wonder if I need the self-aligning or not. Also, what would be better? The Holley TBI or the Edelbrock MPFI system that uses the stock TBI? Which one is more reliable or should I stick to the original GM TBI? Thanks for any help.
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    The 5.7 in the trucks didn't get rollerized til 96 AFAIK. My buddies 89 has regular stamped steel rockers and a flat tappet cam.

    I would stick with factory parts...but that's just my personal preference.

    Rene
     
  3. 84_Chevy_K10

    84_Chevy_K10 Banned

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    I've heard rumours that when they rank out of flat tappet motors, trucks got roller cams--which from what I hear was well before 1996. You can be sure that ALL 1996 and newer 350s are roller cam, but 87-95, from what I hear, can go either way.

    My personal experience with these motors says that most are flat-tappet, but others I've talked to online say otherwise.
     
  4. Mr.Chevy4x4

    Mr.Chevy4x4 1/2 ton status

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    I just pulled apart a '88 350 TBI truck motor and yes it did have the self aligning rocker arms. I think the TBI heads require them.
     
  5. 89GMCSuburban

    89GMCSuburban 1/2 ton status

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    1.6 rockers are about the same price as a cam change once I buy the pushrods too, would the rockers or cam be a better choice. THe only problem is that the motor has 195,000 miles on it, so is tearing the motor half apart worth it?
     
  6. dyeager535

    dyeager535 1 ton status Premium Member

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    Well, if its running good, a spare motor acquisition and long running build up (as you get the money) is a nice option too! (if it ain't broke, don't fix it IMO)

    If you can spend the time to build a motor the way you want, and spend the money you need to, I think you'll be happier. Full roller rockers along with headers are two things I would do if I didn't want to wait, since both can be used in most any subsequent engine buildup, whereas a cam can be kind of iffy.

    Don't really like the idea of only going halfway on a motor with that many miles...my theory is, as soon as you mess with something that old, that runs good, something is going to fail : )
     
  7. fbsadmin

    fbsadmin Registered Member

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    I've torn my '89 350 TBI apart a few times now, and it does has self aligning rockers.
     

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