What do they look like? They have like a cross? I know they're dished, now I did the spark plug and wire to find out what motor I had and it's smooth I even put a little light. It's a 4.8 right id be able to feel bumps if it was a 5.3

And I can't go off the vin

 

https://www.performancetrucks.net/fo...d.php?t=436957

 

your prob not gonna be able to feel all the way too the edge of the piston by going through the spark plug hole unless you have something thats flexible

 

It was a Little light from snap on and its flexible, like a snake light. I don't wanna take off the heads :/ its the dishes 6.0 pistons that have the cross?

 

yea a slight cross https://ls1tech.com/forums/parts-cla...317-heads.html

 

And it would look obvious and I would feel it right?

 

What year are you dealing with?

 

2005
.

 

The pistons on the right should be the 5.3 pistons with the little cross and a dished lip on the edge.

I told you how to do it without taking the heads off.

Take a spark plug out of the head and scrape a drinking straw across the piston deck. its super easy and wont cause any harm. DO IT

 

Lol i did it! and yeah its a flat top, but i was just making sure