The years produced for the cylinder layout v8 are what?
CREATE TABLE "table1_26352332_4" (
  "engine_family" text,
  "cylinder_layout" text,
  "displacement_s" text,
  "injection_type" text,
  "years_produced" text
);
SELECT "years_produced" FROM "table1_26352332_4" WHERE "cylinder_layout"='V8';