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need tune-up specs on 454

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by spincast375, Sep 13, 2005.

  1. spincast375

    spincast375 1/2 ton status

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    Can anyone provide the following:

    timing specs (how many degrees off of TDC)?
    spark plug gap?
    points gap (HEI distributor)?

    Thanks. This engine is not standard Blazer, and I cannot locate these simple numbers.

    Thanks.
     
  2. onlychevy6

    onlychevy6 1/2 ton status

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    what year?
     
  3. spincast375

    spincast375 1/2 ton status

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    We don't know the year. It is a 76 frame, 84 body, and a 454 with 7,000+ miles on it. We did not install the engine, the po did.
     
  4. Bigg R

    Bigg R Registered Member

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    35* Total Advance (BTDC)
    .035 plug gap(points distributor)
    .045 plug gap(HEI distributor)
    There are no points in an HEI!!!
     
  5. spincast375

    spincast375 1/2 ton status

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    This shows me what I don't know. Am I in trouble, or what?
     
  6. spincast375

    spincast375 1/2 ton status

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    The marker on the face of the block (after I cleaned it) goes from -4* to +16*. Looks like I have an ~'88 block (?).
     
  7. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    There should be a number on the back of the block (towards the bellhousing). If you can give us that number, we can find out what year(s) that motor is from.
     

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