4.8 or 5.3?

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Jan 5, 2004 | 06:23 PM

sleepyp1

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4.8 or 5.3?

How can you tell the difference in the two since they both use thr same block?

Jan 5, 2004 | 07:38 PM

Mike98WS6

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Are u talking about the heads? As far as I know there is no difference. Someone correct me If I'm wrong.

Jan 5, 2004 | 07:39 PM

sleepyp1

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Please Help!!!

I need to know how tell the diff between the 4.8 and 5.3 motor they both have the same casting number.

Jan 5, 2004 | 07:53 PM

sleepyp1

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No, I talking about the block I think all's the same except thr stroke. There should be a way to tell the diff on thr bloke somewhere

Jan 5, 2004 | 07:55 PM

sleepyp1

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Man I have to change this keyboard!

Jan 6, 2004 | 05:50 PM

ktmrider

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From: Albuquerque, NM

The blocks are identical. They are even stamped 4.8/5.3 from the factory. The only major difference in the engines is the stroke/crank and rods. The crank and rods from the 5.7 LS1 motors are the same as the 5.3 motor. The 5.3 differs from the 5.7 by bore only ( also iron vs aluminum ). Here are the numbers:
Engine Bore Stroke
4.8 3.78"/96mm 3.48"
5.3 3.78/96mm 3.62"
5.7 3.90"/99mm 3.62"
6.0 4.00"/101mm 3.62"
I'm pretty sure of the numbers but the GM website has them all. FYI, I am having a 5.3 block bored out to 3.898 and using stock LS1 heads and pistons. I have a post in the Internal section and it leads to other threads on the same vein. Hope it helps.