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Crate engine motor and octane requirements

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 76chevy, Sep 21, 2000.

  1. 76chevy

    76chevy 1/2 ton status

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    Does anyone know the minimum octane number that the following crate engines need?

    $1299 190 hp and $2099 330 hp (prices are estimates)

    I would like more power than 190hp. What else do you need to buy with the 330hp? I have TH350 with NP203. If the gas is 91 octane I'll probably stick with the 190hp motor. I can't afford these gas prices.

    One more question. Is the intake manifold for the 190hp stock or a GM performance model?
     
  2. '73 K5

    '73 K5 1/2 ton status

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    I have the new L31 Vortec heads on my 350. I used the thicker head gaskets and I can get away with 89 octance pretty easily. I think thats about the same set-up as the 330 horse engine. Same heads at least.

    '73 K5
    Chevy good...Ford bad
     
  3. DMK

    DMK 1/2 ton status

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    The 190 hp engine will run on 87, the 330 will need at least 89.
     
  4. Zepplin

    Zepplin 1/2 ton status

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    I believe most of them run on 92 octane. I looked at the crate engines on the GM performance parts sight and I know that the 502 and the 454 engines run on 92.

    Dazed and Confused in a 74 Blazer

    ZEPPELIN
     

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