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What type of engines do we have

Discussion in 'The Garage' started by SlicksInRain, May 2, 2007.

  1. SlicksInRain

    SlicksInRain 1/2 ton status

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    I just want to know what you would call our engines. For example LT1, LS1 that kinda stuff. Is there a link that has this info? I always thought we had LT1s but I was told that was only in Camaros and Caprices. Anyone have a model number or at least the one for my 1990?
     
  2. 1977k5

    1977k5 3/4 ton status Vendor

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    The engines in K5's have designations, but it isn't LT1.

    LT1's have a reverse cooling system, an optispark distributor mounted on the front of the motor and a bunch of other stuff that is unique.
     
  3. mello_yello

    mello_yello 1/2 ton status

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    first generation small block chevy, V8,
    or fourth generation Big Block Chevy V8
    i dont know the designation of the diesals, or the option numbers
     
  4. bigjimmy82

    bigjimmy82 1/2 ton status Premium Member

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    call it SBC350
     
  5. SlicksInRain

    SlicksInRain 1/2 ton status

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    I got the factory engine out and wanna know what model parts to look for performance wise. It's been rebuilt and isn't much like the original at all, so maybe it's something else now??? :confused:
     
  6. BGKYK5

    BGKYK5 3/4 ton status GMOTM Winner

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    As I understand it LT1, LT4, LS1, LS2, etc are the engine's RPO (regular production option) codes. All your RPO codes should be listed on a sticker in you glovebox. Mine (a TBI 350 from a '89 K5) is an L05. You can look up RPO codes on websites like http://www.73-87.com/chevy_ids/sbrpo.htm and http://www.chuckschevytruckpages.com/rpo_codes_1973-87.html . Be carefull because the meaning of an RPO code may change from model year to model year. If the engine is not stock you can look up the casting numbers using http://www.mortec.com/ . Hope that helps.
     
  7. mello_yello

    mello_yello 1/2 ton status

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    i believe your correct on the RPO thing, casting #'s i think are more important probably too
     
  8. SlicksInRain

    SlicksInRain 1/2 ton status

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    Thanks thats just what I was looking for.
     
  9. muddermilitia

    muddermilitia ThatTrazerGuy GMOTM Winner

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    don't the newer k5s, 89-91, have reverse cooling systems? When I replaced the water pump on my 89 I was looking for a good aftermarket one (with more flow) there was only like one or two companies that offered one for me.

    But if I searched for a 85 k-5 with 350, there were a ton of companies that offered a high volume water pump :dunno:
     
  10. kp texan

    kp texan 1/2 ton status

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    As far as I know, the first time GM used reverse flow cooling was in the '92 LT1 Corvette.

    -Wes
     
  11. Russell

    Russell LB7 Tahoe Status Premium Member GMOTM Winner

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    The newer trucks need a reverse flow waterpump, but that is becuase the serpentine systems those trucks have make the waterpump turn backwards. The fluid still flows in the same direction as the older trucks though
     
  12. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    LT1's were the "hot" small blocks in the early 70's . Its just an RPO number , and they DO get recycled by GM .
     

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