I read so many post in the search area about replacing the heater core, 98% are the same and just state the obvious about it being a long process. I am looking for a link or instructions with some pictures from someone that has done a write-up about it.

I have 1994 siverado 1500 5.7L

 

not sure what year model those instructions are for but on the 94 year model all you have to do is remove 6 screws from the heater cover that is on the bottom of the heater case, then pull the cover off and the heater core is right there in your face, remove one retainer clip and the 2 hoses and pull it through the fire wall. it also will help to pull the carpet back to give you more elbow room. this took me about 30 minutes to install, and $35 for the part. I did my sons heater core in his 2000 f150 last week and it took 4 hours, on the ford I did have to remove the entire dash.

 

i thought it was for your year ...guess not sorry