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These are actually early 1938. You can tell this by the copper color of the rockers and the steel insert on the rocker box. 1936/'37 rockers had a cadmium looking finish on them. The rocker boxes could be used on a late '36 or a '37 and be correct. The rockers would spray oil everywhere if you used them with the '36/'37 valve spring tins as the oiling holes were in a different location.
These are actually early 1938. You can tell this by the copper color of the rockers and the steel insert on the rocker box. 1936/'37 rockers had a cadmium looking finish on them. The rocker boxes could be used on a late '36 or a '37 and be correct. The rockers would spray oil everywhere if you used them with the '36/'37 valve spring tins as the oiling holes were in a different location.