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Big Block Iron Heads - Are there ID #'s stamped somewhere...?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Greg72, Jan 28, 2002.

  1. Greg72

    Greg72 "Might As Well..." Staff Member Super Moderator

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    Big Block Iron Heads - Are there ID #\'s stamped somewhere...?

    Like the subject line says.....I'm trying to identify what heads are on my engine.

    It's a long story....but it all started with that stupid 850 Q-Jet installation. Since then I've been double-checking all the "basics" on my engine and would like to know whether I have "early" or "late" style heads, confirm that they are rectangular port....etc. I would also like to identify what type of sparkplug is correct for them... I'm currently using the AP145 (Autolite Platinum) 1/2" threadstyle.

    The engine block is a casting #3969854 (1969-72......396Cu In......2 or 4-Bolt Main)

    Apparently, there is more than one iron head that could fit this.....so I'd like to figure out what's there.


    Anyone know where the stampings (or casting #'s) are located?

    Thanks! [​IMG]




    -Greg72

    '72 K5 Blazer - 427BB/TH350/NP205/6" Lift/35x12.50's
    <font color=blue>See it here: </font color=blue><a target="_blank" href=http://coloradok5.com/gallery/albun38>http://coloradok5.com/gallery/albun38</a>
     
  2. J.R.

    J.R. Guest

    Re: Big Block Iron Heads - Are there ID #\'s stamped somewhere...?

    pull off a valve cover, there should be a number on the head. cant miss it.. usually the last 3 numbers will tell the story..

    BIG BLOCK MAN
    "MORE POWER"!!
     
  3. Greg72

    Greg72 "Might As Well..." Staff Member Super Moderator

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    Re: Big Block Iron Heads - Are there ID #\'s stamped somewhere...?

    J.R.,

    Will DO! [​IMG]

    Once I get the numbers, do you have the "secret decoder ring" to tell me what I've got? [​IMG]



    -Greg72

    '72 K5 Blazer - 427BB/TH350/NP205/6" Lift/35x12.50's
    <font color=blue>See it here: </font color=blue><a target="_blank" href=http://coloradok5.com/gallery/albun38>http://coloradok5.com/gallery/albun38</a>
     
  4. HarryH3

    HarryH3 1 ton status Author

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    Re: Big Block Iron Heads - Are there ID #\'s stamped somewhere...?

    Greg, check out www.mortec.com for the casting number details. I found those sites by just plugging the casting numbers from my heads into a web search site at <a target="_blank" href=http://www.altavista.com>www.altavista.com</a>

    And yeah, wouldn't it be nice if they put the casting numbers somewhere just a tad easier to find! [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
    It's a great day to be alive...
     

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