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I am the new owner of a 5.3

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Old 07-04-2011, 01:00 AM
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Aluminum block = L33, if it's a 5.3 and not a 5.7..... I think the 862's have smaller combustion chambers, which would give a higher CR.

Post up a casting number off the block.
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Old 07-04-2011, 01:29 AM
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There's always the magnet test too, if the magnet sticks to the block, it's an iron block. if it doesn't, aluminum.
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Old 07-04-2011, 04:15 AM
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If I remember correctly the casting number was 125513588
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Old 07-04-2011, 01:37 PM
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Should only be 8 digits. When I was looking up casting numbers I did find this:

12551358.........99-up...Gen.III, 4.8L or 5.3L, cast iron, truck

Double check that number, and post up a pic of the engine.
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Old 07-04-2011, 02:34 PM
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ok when i go right now ill check, and ill do the magnet test too
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Old 07-04-2011, 02:35 PM
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Originally Posted by AKlowriderZ71
Should only be 8 digits. When I was looking up casting numbers I did find this:

12551358.........99-up...Gen.III, 4.8L or 5.3L, cast iron, truck

Double check that number, and post up a pic of the engine.
on the block it also says 4.8/5.3 sooo idk if that helps
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Old 07-04-2011, 04:50 PM
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I don't think they made aluminum 4.8s, but I've been wrong before.
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Old 07-04-2011, 06:52 PM
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Old 07-04-2011, 06:59 PM
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Edit on the casting number. 12551358
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Old 07-04-2011, 07:40 PM
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-_- i think the guys gave me the wrong one, the engine on my receipt says 8th digit on vin B but the casting on it isn't the l33 its the lm7
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