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Put a 79 350 in an 89 K5

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by wayne, Jun 10, 2002.

  1. wayne

    wayne 3/4 ton status

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    I know about the TBI issue with the heads. I would use rebuilt TBI heads to cure that. Also I think the TBI heads will help bump the compression up a little. What I am curious about is the reverse cooling on the TBI engine and will it convert over to an older block.
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I thought only the LT-1 used reverse cooling due to the aluminum heads?

    Rene
     
  3. wayne

    wayne 3/4 ton status

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    You might be right but I know my water pump spins backwards compared to the 79 engine.
     
  4. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I'm prolly wrong dude... /forums/images/icons/ooo.gif It may just be any of the sbc's using the serpentine belts that are cooled that way.

    I'm sure someone will set us both straight...

    Rene
     
  5. Blazer1970

    Blazer1970 1/2 ton status

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    TBI motors are not reverse cooled. If your '89 has the serpentine belt, the water pump does turn backward. Just use the water pump (and the fan and fan clutch) that goes with the belt set-up that you are using, and all will be good.
     
  6. muddysub

    muddysub 1 ton suburban status Staff Member Moderator GMOTM Winner

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    i'm doing this too, i have a 1980 350 that i'm gonna turn into a 383 and put in my 89 suburban, i'm going with vortech heads, will i have any problems?
     
  7. dyeager535

    dyeager535 1 ton status Premium Member

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    IIRC, TBI heads still used 12 attachment bolts (4 at either end, 4 in the middle) while I *know* the Vortec heads had only 8 bolts, 4 at either end. EGR is not a possibility through the Vortec heads or intake, has to be tapped from the exhaust pipes.

    In other words, a Vortec TBI intake and the associated EGR setup (if you keep it) would get you on the road.
     

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