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How do you tell a 5.3 from a 4.8 ?

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Old 05-08-2010, 09:02 PM
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Question How do you tell a 5.3 from a 4.8 ?
im going to buy a 5.3 for my truck but i dont know how to tell a 5.3 form a 4.8
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Old 05-08-2010, 09:05 PM
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Vin lookup. Dished pistons vice flat top pistons.
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Old 05-08-2010, 09:05 PM
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check the bore size, or check the inscription on the bottom right hand side of the front of the block. it should say which block it is
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Old 05-08-2010, 09:41 PM
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Originally Posted by honeycutt.dewey
check the bore size, or check the inscription on the bottom right hand side of the front of the block. it should say which block it is
^ 4.8/5.3 have the same bore.

you need to check the stroke with a digital caliper-


crank has a part# also-
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Old 05-10-2010, 01:24 AM
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Originally Posted by max1
^ 4.8/5.3 have the same bore.

you need to check the stroke with a digital caliper-


crank has a part# also-
sorry, meant stroke. thanks for the correction.
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Old 05-10-2010, 03:15 AM
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Aren't the heads different as well?
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Old 05-10-2010, 03:51 AM
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heads are the same on most of these 4.8/5.3
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Old 05-10-2010, 09:31 AM
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Easiest way is to check the glovebox RPO sticker.

4.8s up to 07 should show RPO code LR4, and post '07 should show LY2. On mine the engine code was in the bottom left quadrant of codes.
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