06 Silverado 0 psi compression
Aug 11, 2025 | 08:41 AM
#31
TECH Fanatic
Joined: Oct 2020
Posts: 1,164
Likes: 321
From: DFW
Looks like Summit Racing shows some of those pistons: https://www.summitracing.com/search/...H84AlQovpl_BI-
The 4.8 and 5.3 are the same bore, so basically any "5.3" piston will work in your 4.8, as long as the piston geometry (domed, dished, valve reliefs, etc) yields the correct C.R. and valve-to-piston clearance is satisfied.
The 4.8 and 5.3 are the same bore, so basically any "5.3" piston will work in your 4.8, as long as the piston geometry (domed, dished, valve reliefs, etc) yields the correct C.R. and valve-to-piston clearance is satisfied.
Aug 11, 2025 | 08:57 AM
#32
Hello,
I would like to call my self lucky because the rod, rod bearings and cylinder are all undamaged.
I spent a lot of time looking for forged pistons for the 4.8L, I will admit I am very new to full engine rebuilds so I could of missed something. But I couldnt find forged pistons that would fit the 4.8L, every forged piston I found stated it was for a 3.622 stroke. So would that mean the wrist pin height would of been different?
I asked the sales rep at Brian Tooley racing and summit, they both told me that they dont have a forged set for the 4.8L. Again i am new to this so i could have missed something.
I would like to call my self lucky because the rod, rod bearings and cylinder are all undamaged.
I spent a lot of time looking for forged pistons for the 4.8L, I will admit I am very new to full engine rebuilds so I could of missed something. But I couldnt find forged pistons that would fit the 4.8L, every forged piston I found stated it was for a 3.622 stroke. So would that mean the wrist pin height would of been different?
I asked the sales rep at Brian Tooley racing and summit, they both told me that they dont have a forged set for the 4.8L. Again i am new to this so i could have missed something.
Any way, sadly neither sales person was educated enough... GM made the L33 5.3L in 2005. It uses a flat top piston. Guess we're that piston came from... the later gen4 5.3L also used those piston.
As mentioned icon does have a piston that will work In a .020 bored nd other sizes.
https://www.summitracing.com/parts/uem-ic9985c-020
Aug 11, 2025 | 09:03 AM
#33
Thread Starter
Teching In
Joined: Aug 2025
Posts: 18
Likes: 7
Thank you! I will have to look into those pistons when I do a fully forged bottom end on the block I have sitting in my garage right now.
This was supposed to be a budget build which didnt turn out to be much of a budget.
This was supposed to be a budget build which didnt turn out to be much of a budget.
Aug 11, 2025 | 10:43 AM
#34
DuNnO
Joined: May 2018
Posts: 1,285
Likes: 580
You would be better off just using a 5.3 crank and rods.
And i was looking at those pistons. They dont look like a quality piece.
I use DSS pistons in majority of my engines if they need pistons. But have never "built" a 4.8 with after market goodies.
They were all just needed a refresh so rings/bearings and such.
And i was looking at those pistons. They dont look like a quality piece.
I use DSS pistons in majority of my engines if they need pistons. But have never "built" a 4.8 with after market goodies.
They were all just needed a refresh so rings/bearings and such.
Aug 11, 2025 | 12:38 PM
#35
Just an FYI, When you do a forged bottom end, the forged rods typically use a smaller .927 wrist pin. Then you will have to step up to the premium line of pistons.
Thread
Thread Starter
Forum
Replies
Last Post
BigKID
INTERNAL ENGINE MODIFICATIONS
7
Mar 24, 2014 06:00 PM
coletrain777
GM Engine & Exhaust Performance
2
Oct 6, 2013 12:35 PM