engine number help

[ashmini]

hi hope somebody can help just got me a 1977 targa trying to find out what engine i have in it as looking for a full gasket set the number is 6878001 thanks

[totle]

That is a 1977 911 turbo engine

first digit: 6 cy engine
second: 8 US turbo
third: 7 1977 model year
rest digits : serial number in that year for this engine type