Engine Casting Numbers Engine Year Type Casting Number 340 1971 LA 2780930 383 1971 B 2568130 440 1971 RB 2536430 Cylinder Head Casting Numbers Engine Year Intake Exhaust Casting Number 340 1971 1.88 1.60 3418915 383 1971 2.08 1.74 3462346 440 1971 2.08 1.74 3462346 Exhaust Manifold Casting Numbers Engine Year Side Casting Number 340 1971 Right 3148623 340 1971 Left 3418621 383 1971 Right 2899879 383 1971 Left 2951865 440 1971 Right 2899879 440 1971 Left 2951865 LA, RB/B Intake Manifold Casting Numbers Engine Year Casting Number 340 1971 3512099 383-4 1971 2951666 440-4 1971 3512501 440-6 1970-71 2946275 EARLY 440-6 1970-72 2946276 Hemi 1969-71 2780543 Hemi 1969-71 2780544