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85 crate motor in an 86 blazer? flywheel/harmonic balancer same?

Discussion in 'The Garage' started by xtrmjoe, Aug 8, 2006.

  1. xtrmjoe

    xtrmjoe 1/2 ton status

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    I priced out a crate motor for my 86 and they wanted over 2000. But the one for an 85 is only 1400. I know the rear main seals are different. So do just get a new flywheel for an 85 to? and is the harmonic balancer the same as well? Anything else I need to look out for?
    I searched a lot and did not find exactly what I was looking for 86 is a weird year new rear main seal but still carb.
     
  2. blazin83

    blazin83 Registered Member

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    if the crank is the same it should bolt up??
     
  3. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    The 85-86 engine has a neutral balance harmonic balancer but the 1986 uses a different flexplate with a smaller bolt circle and it is external balanced unlike the 1985 and earlier SBC's which are internal balanced.
     
  4. xtrmjoe

    xtrmjoe 1/2 ton status

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    Any engine experts have a difinitive answer I am buying this thing tomorrow?
     
  5. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    If you look at my profile you'll find out i am an engine expert with 20 years professional experience.
     
  6. xtrmjoe

    xtrmjoe 1/2 ton status

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    No offence I was just looking for a 2nd opinion to verify befeore I go spend a boat load of cash.

    Thanks for the advice!
    Iam getting the engine in the AM it is going to be a good weekend :)
     

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