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

generates a code of length 42 over Z8 who´s minimum homogenous weight is 34.

Homogenous weight enumerator: w(x)=1x^0+48x^34+92x^35+112x^36+178x^37+260x^38+322x^39+408x^40+460x^41+450x^42+422x^43+355x^44+316x^45+252x^46+158x^47+71x^48+60x^49+68x^50+30x^51+12x^52+10x^53+8x^54+2x^58+1x^60

The gray image is a code over GF(2) with n=168, k=12 and d=68.
This code was found by Heurico 1.16 in 0.568 seconds.