Where the displacement(s) is 10.5L is, what is the engine family?
CREATE TABLE "table1_26352332_4" (
  "engine_family" text,
  "cylinder_layout" text,
  "displacement_s" text,
  "injection_type" text,
  "years_produced" text
);
SELECT "engine_family" FROM "table1_26352332_4" WHERE "displacement_s"='10.5L';