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Forced Induction Superchargers | Turbochargers | Intercoolers

4.8 or 5.3 pistons?

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Old Mar 14, 2012 | 09:23 PM
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Default 4.8 or 5.3 pistons?
trying to figure out if this is a 5.3 or 4.8.
flat top pistons with a cross in the middle


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Old Mar 14, 2012 | 09:37 PM
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Measure the bore and stroke... Doubt you'll be able to tell by casting patterns.
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Old Mar 14, 2012 | 09:42 PM
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so is there 5.3s with flat top pistons?
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Old Mar 14, 2012 | 09:46 PM
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as far as i know only l33's came with the flat tops in a 5.3 which is an aluminum block. havnt researched it though. They do share the same compression height and bore size though and are all interchangeable.
Last edited by got-a-ls1; Mar 15, 2012 at 10:54 PM.
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Old Mar 14, 2012 | 10:36 PM
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Looks 4.8. Find BDC and put a tape measure down the hole. 3.6" = 5.3l. 3.2"=4.8. want to sell those pistons?
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Old Mar 14, 2012 | 11:02 PM
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Originally Posted by Vents
Looks 4.8. Find BDC and put a tape measure down the hole. 3.6" = 5.3l. 3.2"=4.8. want to sell those pistons?
lol.
i just got this motor for my car..so either its a 4.8 or 5.3 im still gona use it.

ill be putting the ls9 headgaskets for safety. will this lower compression some?
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Old Mar 14, 2012 | 11:15 PM
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The conversion section has a sticky on 4.8/5.3 info
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Old Mar 15, 2012 | 05:26 AM
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Does it not say on the back of the block?
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Old Mar 15, 2012 | 07:48 AM
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Originally Posted by BottleFedZ346
Does it not say on the back of the block?
All 5.3s and 4.8 say " 4.8 / 5.3"
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Old Mar 15, 2012 | 08:27 AM
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Originally Posted by a4ls2goat
lol.
i just got this motor for my car..so either its a 4.8 or 5.3 im still gona use it.

ill be putting the ls9 headgaskets for safety. will this lower compression some?
You want lower compression? I've got a set of dished pistons for ya. Straight trade?
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Old Mar 15, 2012 | 08:41 AM
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Originally Posted by Vents
You want lower compression? I've got a set of dished pistons for ya. Straight trade?
Lol.. nah man. I don't wana touch the short block. I wana see how far I can push it.
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Old Mar 15, 2012 | 12:53 PM
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flat tops = 4.8, dished pistons = 5.3
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Old Mar 15, 2012 | 02:07 PM
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Did you hurt the motor in your car already Hector?
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Old Mar 15, 2012 | 02:13 PM
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I pulled my ls2 to put forged internals.. that's it.. pulled it before it did mess up. Haha.
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Old Mar 15, 2012 | 02:58 PM
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Originally Posted by a4ls2goat
I pulled my ls2 to put forged internals.. that's it.. pulled it before it did mess up. Haha.
Smart if you did. I don't think many people will believe you though. Make sure your tuner keeps the timing very conservative with these stock bottom ends your using. They will stay alive and make power but will f*ck up alot of your parts when they go.
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Old Mar 15, 2012 | 03:59 PM
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Im leaning to beleive it's a L33, when i had mine the pistons were flat top's and the cross....
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Old Mar 15, 2012 | 06:00 PM
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Originally Posted by BottleFedZ346
Im leaning to beleive it's a L33, when i had mine the pistons were flat top's and the cross....

L33's are aluminum, that block is clearly iron. Measure the stroke as people are saying to find out if its a 4.8
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Old Mar 15, 2012 | 08:39 PM
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Originally Posted by projectcam
Smart if you did. I don't think many people will believe you though. Make sure your tuner keeps the timing very conservative with these stock bottom ends your using. They will stay alive and make power but will f*ck up alot of your parts when they go.
Really? I can give a **** if people believe me..
The car was tuned on 10 degrees of timing on the ls2. Than I said **** it, I'll pull the ls2 and put a JY motor in while I forge the ls2. Plain and simple.
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Old Mar 15, 2012 | 08:41 PM
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Originally Posted by silver_82
L33's are aluminum, that block is clearly iron. Measure the stroke as people are saying to find out if its a 4.8
I do believe the 4.8 pistons are the same ones as the l33
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Old Mar 15, 2012 | 11:02 PM
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Originally Posted by a4ls2goat
I do believe the 4.8 pistons are the same ones as the l33
Right, i believe they use the same pistons, but he said he believes it may be an l33. Was stating that an l33 is an aluminum 5.3 and that tbe block in the pic looks to be iron.

Did u measure the stroke?
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