Determining Engine for new Dipstick

[Foxcroft80]

Hi All,

I apologize for my ignorance - I'm new to mechanics but am loving it so far and am trying to learn!

I had posted last week that my dipstick was getting chewed up and I need a new one. I called the GM place and they directed me to get the casting ## off the engine. The engine is in the truck so after fumbling around I found this ## on the front driver side: 3970014. I did note that the engine has the word PERFORMER stamped into it. Is this enough info to give the dealership? They were mentioning a number with letters/numbers but the only combo like that I found was on the exhaust manifolds. What am I missing??

Any help would be appreciated...