CREATE TABLE table_46391 ("Driver" TEXT, "Race 1" TEXT, "Race 2" TEXT, "Race 3" TEXT, "Race 4" TEXT)

What's the value for race 4 for driver kevin heffernan?
SELECT "Race 4" FROM table_46391 WHERE "Driver" = 'kevin heffernan'
SELECT "Race 4" FROM "table_46391" WHERE "Driver" = 'kevin heffernan'