CREATE TABLE table_26967904_1 (chambering VARCHAR, f_bolt VARCHAR, p_max___bar__ VARCHAR)

With what type of chambering is the F bolt n (lbf) and the P max (bar) 3900?
SELECT chambering FROM table_26967904_1 WHERE f_bolt = "N (lbf)" AND p_max___bar__ = 3900
SELECT "chambering" FROM "table_26967904_1" WHERE "N (lbf)" = "f_bolt" AND "p_max___bar__" = 3900