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Engine code header and model disagree..

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    #1

    Engine code header and model disagree..

    I own a 91 ex, the block says it's an a1 but the header and wikipedia say its an a4 haha.. So, my question is, should the block say a4 or are a4's a1 blocks?

    Or has my motor been replaced?

    I know it's the a4 header because its the nice 4-2-1..
    Tags: None
    #2
    If the block says A1, the motor has been replaced. Of course, the ONLY difference between the A1 and A4 is the exhaust manifold, so aside from that stamp, you have an identical engine to what should be under there.

    Unless, of course, you are in Canada. Canadian EX models are the equivalent to the US LX models... and they come with an A1.






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      #3
      Nope, not Canadian! Thanks for the input.

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        #4
        I was under the impression that all EX's came with A6's, but don't quote me on that one. Odds are the motor has been replaced for one reason or another. As far as I know the bottom end from A1 to A6 is identical, but they will have their proper code stamped into the block regardless. Good sleuthing though.

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          #5
          Only 92-93 EXs have the A6. 90-91 has the A4, which is the same as the A1, but with a tubular exhaust manifold.






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