CREATE TABLE table_181892_4 (laps_led INT, chassis VARCHAR)

What is the largest laps led with the lotus-ford 34/3 chassis?
SELECT MAX(laps_led) FROM table_181892_4 WHERE chassis = "Lotus-Ford 34/3"
SELECT MAX("laps_led") FROM "table_181892_4" WHERE "Lotus-Ford 34/3" = "chassis"