There are no LA 318's externally balanced. The 67 and 68's did leave the factory with steel cranks, but if it was rebuilt who knows. The 73,74 and some 72's 340's had cast externally balanced cranks. They are the same size phiscally but I've been told they have different bob weights (heavier rods and pistons). So if you have a unmolested 67 it's likely a steel crank. The only premium fuel 318 I know of is the Mexican version. LA 318's are internally balanced, Period! If your 74 318 was rebuilt it might have a steel crank, otherwise it's a cast crank internally balanced motor..but it's a good motor to build on!
