Help identify motor

Discussion in 'Troubleshooting & Diagnosis' started by Jamese279, Aug 8, 2017.

  1. Jamese279

    Jamese279 New Member

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    Aug 8, 2017
    Pad on motor has been machined so VIN is gone. But I have the following:

    Block: 3970010
    Block Date Stamp: C69
    Heads: 3927186
    Heads Date Stamp: I69
    Crank: 3932442
    4 Bolt Main

    I've narrowed to a 350 but don't know it's 300hp or 350hp? Also, what vehicle was it used in? Thoughts?
     
  2. Gary S

    Gary S Administrator Lifetime Gold Member

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    Apr 14, 1999
    Bismarck, North Dakota
    You need the engine code stamped on the front pad to identify it. Without that, you can look at the valve size. 300hp would have 1.94 and 350hp would have 2.02. Also, the pistons are different. 300hp had flat top pistons, 350hp had dome pistons. But, if the block has been decked, the original parts might no longer be in the engine.
    The numbers you posted only tell us that it is a 1969 350.
     
  3. Jamese279

    Jamese279 New Member

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    Aug 8, 2017
    Well it does have 2.02 valves so I guess that makes it a 350HP. What vehicles were these used with in '69?
     
  4. 70lt1z28

    70lt1z28 Veteran Member Gold Member

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    Oct 3, 1999
    Beavercreek, Ohio, USA
    Corvette only had the 350-350. It would be a 4 bolt main also.

    Block and heads dates are too far off to be original to each other. Due to this, the heads may have had bigger valves fitted or be from another engine. Do the pistons have domes or are they flat? They could be changed out also.
     
  5. Jamese279

    Jamese279 New Member

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    Aug 8, 2017
    Domed pistons are what it currently has. So with what we know does a 750cfm carb make sense?
     
  6. Gary S

    Gary S Administrator Lifetime Gold Member

    20,634
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    Apr 14, 1999
    Bismarck, North Dakota
    Originally the 350hp 350 had a quadrajet that flowed around 750cfm, so as long as it is a vacuum secondary 750, it would work just fine.
     
  7. 74BIBELOT

    74BIBELOT Veteran Member

    What about crankshaft? It's a cast one?
     
  8. Jamese279

    Jamese279 New Member

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    Aug 8, 2017
    Yes. It is cast (#Crank: 3932442)
     
  9. 74BIBELOT

    74BIBELOT Veteran Member

    Everything looks good except the crank, as Gary said look for the engine code, also try to identify the rods, timing cover , camshaft.
    I am agree with 70lt1z28 about heads/block dates 6 month apart.
     
  10. jbloake

    jbloake Veteran Member

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    May 1, 2002
    Canada
    Is there a Vin# near the oil filter. That would tell you what factory the block was installed
     

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