Whats the difference between this heads? Head Cast #: 1185485, 1190415, 1196914, 1374603

The only real difference are ther casting #s and the year they were made. All of them have the same design and will fit any 364, 401 or 425.

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Steve B.
GSCA #2173 (1986)
67 GS 525 Stg IV
66 GS Convertible
65 GS HT
63 Riv

Thanx Dr