2004 Sierra -spotting the difference between a 5.3 and a 6.0

[mtntrogger]

New member here, first post. Looking for help -

I bought this 04 sierra 1500 a couple of months ago and recently noticed something that has me questioning what engine is in it. The ad said 6.0 and the doors have the 6.0 vortec logo on the side and it certainly feels like it has 6.0 balls. However, for some reason I was decoding the vin # and noticed that the engine code for this truck is "T" which is the letter code for the 5.3 engine ? It appears that only the Denali package had the 6 litre. Is there any obvious way to tell which it is without having to look for the EIN on the back of the block ? Thanks

 

[CamGTP]

Whats' the casting number on the cylinder heads?

[shakenfake]

Casting number on cylinder heads or just crawl underneath and on the back of the block it will say 6.0 in a big ass stamp

 

IDK what EIN means