what is the vehicle code where the bore is 79.4?
CREATE TABLE "engines" (
  "vehicle_code" text,
  "bore_mm" text,
  "stroke_mm" text,
  "capacity_cm_3" real,
  "compression_ratio" text,
  "torque_n_m" real,
  "power_hp" real
);
SELECT "vehicle_code" FROM "engines" WHERE "bore_mm"='79.4';