ZONES89RS

iTrader: (25)

I am assuming the only way to tell is to measure the stroke of the piston, other than that, is there any way to tell? Have a friend with a 5.3/4.8 block and we need to know what it is, what would the stroke be from BDC to TDC between the two in inches?

02sslayer

iTrader: (4)

I heard lsxnation has the answer

Deuce426

I've also heard a way to tell is if you look at the block, the displacement is cast onto it saying 4.8/5.3 If you are lucky enough for the block to still have its paint, there is the possibility of the paint marking being there to that marked which it was. All they did was put a paint mark on whichever the displacement was.

Also if you have the heads off and are looking at the pistons. The 4.8 has flat top pistons, while the 5.3 had a slight dish to them.

If none of the above work, you've got to do it the hard way.

The_Rizzle

iTrader: (4)

the pistons - iron block dished piston is 5.3. iron block flat top is 4.8. this is pre 07.

ZONES89RS

iTrader: (25)

Ok, then it is a 4.8, i remember it had the FTs in it.

Thanks fellas.

NemeSS

iTrader: (127)

4.8s rock!
pump some psi thru that beesh!

ZONES89RS

iTrader: (25)

Its not mine, i want the 5.3 or better...

98Aggie

iTrader: (19)

3.2 stroke - 4.8
3.6 stroke - 5.3

tripblackls1

iTrader: (11)

if it still has the oem headgasket on it there will be a lil tab that sticks out the side and it will say either 4.8 or 5.3 (usally dirty need to clean it real good to see what it says)

or just pull a spark plug put the piston at tdc and see if its a dished or flat top piston