you can contact Marlin Firearms and they should help with a rifle that is some what new like yours.
1988
1988.
1996.
1990
Your serial number indicates the year 1987.
Age is 1984, but values depend on condition.
Your Marlin model 336CS(Carbine Sporter)was made in the year 1987.
Yes the serial number is needed to get the year of production.
The first two numbers of later model Marlin rifles indicate the year made. Your rifle was made in 2004.
If there is no letter prefix on your serial number you subtract the first two numbers from 100 so it would be a 1989
My Brother has a 336C and he bought it new in the mid 60's.
Don't know value. Year of manufacture is 1990.