The "327" emblems are 1/2 of the entire engine callout emblem that Chevrolet used as seen above. Some of the cars this emblem was used on are:
1965 - 1967 Chevelle/Malibu
1965 - 1967 Chevrolet Full Size
1965 - 1967 Chevy II/Nova
1967 Camaro
The "396" emblems are for the 1968 Camaro SS396
