K18 will just tell you that they were made in 1968 or 1978. The application code is a two letter code that is near the valve stem hole. Take a look there and post what you find.
Team Camaro Gold Member #14
1967 Camaro RS/z28 - one of 602 made - SOLD
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1969 Camaro RS/SS L48 4 speed
1974 Camaro LT-Z/28 4 speed 33K orig miles
1979 Camaro Z/28 36K orig miles
1987 Monte Carlo SS 25K orig mi bought new by me.