Buick’s engine plant factory #36 in 1966. These engines are as follows, red either 300 cubic inch for the standard passenger cars or new for 66 340 cubic inch for the station “sport”wagon. The new Skylark Gran Sport received a 400 cubic inch. The Le Sabre’s used the new 340. Wildcats and Electra’s used the 401 cubic inch but also available was a 425 cubic inch. The blueish/green is the 225 cubic inch V6.