Ok so here goes. I know that the 4.8 and the 5.3 have the bame bore, so in theory I could use 4.8 Flat top pistons in my 5.3. So what are the advantages/disadvantages to doing this. Would it be worth the money to get that little bit higher CR? Or will it just be better to leave well enough alone?

Thanks, Josh

 

i beleive that i read the 4.8 piston has a different wrist pin height or something, anyways its meant for the 4.8 rod

 

So it wont work in a 5.3, damn there went my hopes and dreams

 

id let some one that knows for sure chime in but i dont think they will

 

i dont think they will either....not sure though but i think that when you make a 4.8 a 5.3 you have to change the crank, rods, and pistons so it makes sense you would have to going opposite.....also i know the crank is diff. for a 5.3 than a 4.8 so you might have clearance issues with the flat top piston as oppose to the dish piston if you use the 5.3 crank....dont know from personal experience though....

 

there are factory 5.3 flat tops.

 

from the L33, i forgot about those, but they are probably few and far between

 

If I did could find some L33 pistons, would it be a worthy upgrade. It will raise my CR from 9.5-1 to 9.9-1. Or should I just shave the heads and get that much or even more.

 

If you go flat top pistons you will also need 64 cc heads to bring CR down to 9.9:1

 

Read this it will tell u everything!
http://www.automotiverebuilder.com/ar/eb040538.htm