Generation III Internal Engine 1997-2006 LS1 | LS6
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4.8 or 5.3

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Old 11-01-2016 | 01:58 PM
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Default 4.8 or 5.3



if your not sure if its an iron block 4.8 or 5.3, buy a $15 bore scope that plugs into your laptop with a usb end. I used windows movie maker. this is my 5.3 thru the spark plug hole. dish on piston tells me its a 5.3. 4.8 piston has no dish. its cheep and you can find problems without removing anything but spark plugs. mine was made in china.

Last edited by old guy 2; 11-02-2016 at 05:51 PM.
Old 11-02-2016 | 06:13 AM
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One thing to remember.
Dished pistons means its a 5.3, flat tops means its either a 4.8 or 5.3.
Old 11-02-2016 | 07:38 AM
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all 5.3 are dish pistons, all 4.8 are flat on gen 3.
Old 11-02-2016 | 07:47 AM
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Originally Posted by old guy 2
all 5.3 are dish pistons, all 4.8 are flat on gen 3.
Not true. There are flat top Gen 3 5.3s.
Old 11-02-2016 | 08:29 AM
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are you talking about L33 alum block motors which are cast with 5.3 on them?
Old 11-02-2016 | 08:33 AM
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Originally Posted by old guy 2
are you talking about L33 alum block motors which are cast with 5.3 on them?
Yes, but it doesn't change the fact that its a flat top 5.3




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