The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  2  2
 0  2  0  2  0  0  6  6  0  0  2  2  0  0  6  6  4  4  2  6  4  4  6  2  4  4  2  6  4  4  6  2  0  4  2  6  0  0  6  6  4  0
 0  0  2  2  0  6  6  0  4  6  6  4  4  2  2  4  4  2  2  0  4  2  6  4  0  6  6  4  0  6  2  0  0  2  2  0  0  6  2  4  2  6
 0  0  0  4  4  4  0  4  4  0  4  0  0  4  0  4  0  0  0  0  4  4  4  4  4  4  0  0  0  0  4  4  0  0  0  4  4  4  4  0  0  0

generates a code of length 42 over Z8 who´s minimum homogenous weight is 40.

Homogenous weight enumerator: w(x)=1x^0+78x^40+96x^42+80x^44+1x^80

The gray image is a code over GF(2) with n=168, k=8 and d=80.
This code was found by Heurico 1.16 in 0.032 seconds.