CashDudeHomie

iTrader: (5)

Maybe the "5.3" you test drove was actually a 4.8 and you have it all backwards!!!

hyper

nah it was from the dealership, 5.3 was on the window. the guy was all tellin me i should upgrade to the 5.3 trying to get me to buy it. but i punched it on the way back, and wasnt surprised at all. i guess i can have it dynoed somewhere? that might tell me

crazyidiot4.8

how would this revel it?

BigTex

iTrader: (16)

Maybe looking for the part number from the crank or rods or pistons. Actually, since the 4.8 has flat top pistons, you might be able to pull a spark plug and see if you have dished pistons or not.

GREGGO

iTrader: (2)

Look at the front of the block on the right side under the head behind the alt(also on the back left standing in front). The numbers 5.3/4.8 are cast into the block. One of them will have a big yellow dot on it. The one that doesn't is your engine ( I will verify this tonight just to be sure). This is not the most technical way of checking, but should let you know.

hyper

so how am i suppose to see this label on the block? i got down there with a flashlight and didnt see anything. i cant get my head down there far enough to see anything under the head