demonsmokr

What the hell are they? Never seen this before. This 5.3 has 6 pistons with these crosses, and two without. Just trying to find out why... I was given a donor block by the auto shop teacher for one of the schools i maintain, we both brain farted and i tore down a 4.8 and took the parts to the machine shop. Who called the next day to remind me im a dingle berry, so shop teacher pulled the rest of the 5.3 long blocks to inspect. Neither of us has seen this before, so just wondering if the pistons with the crosses are OEM or what.

Thanks in advance.

G Atsma

From what I've been led to understand, both types (with and w/o cross) are from different suppliers but are the same spec. They are interchangeable in every way. Both are dished 8cc in the 5.3 case, and flat top in the 4.8 case.

demonsmokr

So, they threw them all in the same bin and whoever assembled the engine just picked them out of the bin? Typical

Ls7colorado

iTrader: (3)

I have never seen an engine with both cross and smooth pistons, someone correct me if im wrong but I would assume some of them have been replaced. Either way that thing looks quite NASTY.... who am I kidding its probably ready to lay down 1000rwhp ... lol

CattleAc

iTrader: (7)

Thats what I'm thinkin'...maybe spray those lifters out with a little brake clean first...1200 to the tire easy...LOL

Che70velle

iTrader: (6)

Heck every Gen3 5.3 I’ve ever even in had the plus signs on the pistons. I’ve never seen them in a Gen4 5.3… I’d say someone has been in it before and did some swapping. If it was from a shop class, I’m sure it was torn down a lot.