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Thread: build a 260Z?

  1. #1
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    Default build a 260Z?

    Hey everyone,

    I know you guys are all about keeping things lightly modified or stock.
    2 pretty straight questions for what could become a large modification (just to get me started).

    I was told the engine in my 71 240z is a 260z engine/transmission. Are there any numbers on the block that would tell me what the truth is? Same for the transmission?

    If it is a 260z, can I bore it to make a 280Z engine out of it (since a 280 is a bored 260, this makes sense, unless i'm missing something)?

    The end result I want is a carbureted 280Z that runs well and fast with a 5 speed transmission, for as cheap as i can do it (i'm pretty good with a wrench, dad welds, need to hire boring/milling)

    Thanks!!

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    Registered User d240zx2's Avatar
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    Somewhere on the passenger side of the block you'll find a stamped indicator: L24, L26, L28 with the motor number following. My Z is in the shop so I cannot visually verify this, but memory sez I'm correct....
    First & Third owner of HLS30-00721
    B. 01/70 D. 03/12

    New owner of HLS30-15653
    B. 12/70 D.

    Frank in Houston, Texas

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    Registered User cbuczesk's Avatar
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    Look on the spark plug side of the block at the top for a flat area. It should be marked "L26" for a 260Z engine...L24 for 240Z engine.

    If the engine is an L26 and it's running well why mess with it?

    Chuck
    East Coast Z Nationals held at the Carlisle Import & Kit Nationals - May 16-18, 2014 Carlisle, PA
    www.carlisleevents.com/events/import
    1969 240Z #390
    1971 Fairlady Z
    1971 240Z parts car
    1972 240Z ITS race car
    1972 240Z turbo
    1974 260Z turbo
    1975 280Z my first car
    1978 620 King Cab

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    Registered User Bonzi Lon's Avatar
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    The numbers will be above the 5 & 6 spark plugs.

    Bonzi Lon
    1973 HLS30-168500
    1968 SPL311-18100
    1969 HLS30-000110 SOLD Shipped to Dubai UAE
    CZCC#11300

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    Registered User Bonzi Lon's Avatar
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    Edit: The numbers are BELOW the 5 & 6 spark plugs.

    Bonzi Lon
    1973 HLS30-168500
    1968 SPL311-18100
    1969 HLS30-000110 SOLD Shipped to Dubai UAE
    CZCC#11300

    Ones and Zeros

    "We drive only blue cars." Dishwalla

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    Registered User LeonV's Avatar
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    Check the head casting number at the same time. It's located between the #1 and #2 spark plugs, on the bottom of the head. Stock 260Z would be E88 (although stock '72-'73 240Z will be E88 as well).
    2/74 260Z

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    thanks for the help!
    it's an L26, with an E88 head. perfect. i appreciate the help!

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