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How to tell the difference between a 318 and 340

Engine Issues

  1. David B

    David B Well-Known Member

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    I bought my 1970 Barracuda used. the fender tag said it came with a 318 but the air cleaner cover says 340 four barrel. How can I tell the difference? I'm having the engine pulled for overhaul so access to the block # should be easy.
     
  2. djais1801

    djais1801 Well-Known Member

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  3. 340challconvert

    340challconvert Well-Known Member

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  4. gzig5

    gzig5 Well-Known Member

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    A 340 generally pushes you further back into your seat than the 318......
     
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  5. Hemivision

    Hemivision Member

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    It's cast into the right hand side of the block in my experience
     
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  6. 340challconvert

    340challconvert Well-Known Member

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    upload_2020-1-15_7-23-17.png
    David, look for a number on the driver's side of the block, front, right below the head. A 70 engine would start with F.
    A 71 engine would start with G. The next letter is where the engine was assembled, followed by the cubic inches engine size.

    Check out the link I posted above; it has actual pictures of number ID locations
    "How to ID a small block engine block"

    It will give you all the information you need with photo locations
    Dino2 (2).gif
     
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  7. David B

    David B Well-Known Member

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    Thank y'all for your help.
     
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