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Where are the casting number on a 1972 engine block?

Discussion in 'The Garage' started by 72Blazerod, Jan 10, 2003.

  1. 72Blazerod

    72Blazerod 1/2 ton status

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    Hi guys,

    I have the a 350/350 set up out of a 1972 GMC 3/4 2wd truck at my place and I may have a potential buyer for it but he wants me to check out the casting numbers (I believe) to tell what type of block it is. He showed me a picture of the numbers on a stripped engine and it looked to me that they were cast right into the block and not stamped. The last three numbers were the important ones and they were 010. Can anyone tell me where on my engine I should look for these numbers to see if I have the correct engine for this guy? Any help is appreciated!!

    Thanks,
    Rod /forums/images/graemlins/1zhelp.gif
     
  2. motorheadnelson

    motorheadnelson Registered Member

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    What's he looking for? The casting number on a 010 block can be found behind the left cylinder head on the flywheel housing. 3970010 is the number. These blocks were used as 69 302 DZ 4 bolts, 69 327 truck and industrial 2 bolts, and 69-80 2 and 4 bolt main truck and passenger blocks. For actual application and hp rating you need the stamped number on the pad in front of the right cylinder head. I have a 69 010 300hp 350 four bolt in the garage. If you need more info, maybe I can help.
     
  3. Sandman

    Sandman 3/4 ton status Author

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    And theres always this place:

    Mortec
     
  4. 72Blazerod

    72Blazerod 1/2 ton status

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    Great, I'll go down to the garage and take a look, I knew one of you guys would know this. Thanks for the helping hand!!! /forums/images/graemlins/thumb.gif

    Rod /forums/images/graemlins/k5.gif
     
  5. 72Blazerod

    72Blazerod 1/2 ton status

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    I found the number. It was 3956618. Was this a good engine? Do you know what the difference is between this and the 3970010 engine? Does this sound like the stock engine for a '72 GMC pickup? Thanks again for the info.

    Rod /forums/images/graemlins/thumb.gif /forums/images/graemlins/k5.gif
     
  6. ben427

    ben427 1/2 ton status

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    Well, with that number, it could be a 1969 302,327,or 350, and it could be a 2 or 4 bolt main. so really you cant tell unless you yank the pan and get a casting # from the crank and count the main bolts.oh well, it was worth a shot /forums/images/graemlins/crazy.gif
     
  7. DEMON44

    DEMON44 Low-Tech Redneck

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    Both options are 4 bolt mains. Just pray you've got the '69 302 /forums/images/graemlins/wink.gif

    1969 3956618 302-290hp - 4bolt main- Z28
    1969-79 3956618 350-165hp 350 4 bolt main- car, truck, vette
     
  8. Sandman

    Sandman 3/4 ton status Author

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    It could be the stock engine. Chances are its a standard 350.
     

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