http://www.buicks.net/shop/reference/engine_ident_where.html
400, 430, 455 inch, 1968 on The engine serial number is between the two front spark plugs and the left exhaust manifold, and the production code number is between the two rear plugs and the exhaust manifold, also on the left.
Pour les masses, regardes sur la porte conducteur, tu as certainement l autocollant GM avec les poids, date de d assemblage et VIN