"small block" meaning in English

{
  "etymology_text": "From the smaller size of the engine block compared to a big block engine.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "small block (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Automotive",
          "orig": "en:Automotive",
          "parents": [
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "having or characterised by a relatively small and lighter engine block"
      ],
      "id": "en-small_block-en-adj-RK6Uj~JG",
      "links": [
        [
          "automotive",
          "automotive"
        ],
        [
          "engine",
          "engine"
        ],
        [
          "engine block",
          "engine block"
        ]
      ],
      "raw_glosses": [
        "(automotive, of an engine) having or characterised by a relatively small and lighter engine block"
      ],
      "raw_tags": [
        "of an engine"
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "automotive",
        "transport",
        "vehicles"
      ]
    }
  ],
  "word": "small block"
}

{
  "etymology_text": "From the smaller size of the engine block compared to a big block engine.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "small block (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English uncomparable adjectives",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Automotive"
      ],
      "glosses": [
        "having or characterised by a relatively small and lighter engine block"
      ],
      "links": [
        [
          "automotive",
          "automotive"
        ],
        [
          "engine",
          "engine"
        ],
        [
          "engine block",
          "engine block"
        ]
      ],
      "raw_glosses": [
        "(automotive, of an engine) having or characterised by a relatively small and lighter engine block"
      ],
      "raw_tags": [
        "of an engine"
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "automotive",
        "transport",
        "vehicles"
      ]
    }
  ],
  "word": "small block"
}