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Is a 403 motor a big or small block?

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Is a 403 motor a big or small block?

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  1. its a small block


  2. 403 is a big block.

  3. Depending on the make, it is usually a big block.

    It could be considered a small block, however it has a high deck height of to allow up to a 4.25 inch stroke which allowed engine sizes up to 455 cubic inches.

    The most common 403 was used in the 1977 -1979  Oldsmobile, Buick, and Pontiac.  It was also used in some 1979 GMC powered motor homes.
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