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4.8 info

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Old 02-13-2009, 09:19 AM
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Default 4.8 info
I know the old saying " there's no replacement for displacement" but why doesnt anyone use GM 4.8s?

Are the specs different from the 5.3s and up?
Are parts from 5.3 and 6.0 compatible to the 4.8?

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Old 02-13-2009, 11:46 AM
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The 4.8 uses a shorter stroke crank, different pin height pistons (but same bore), and longer rods. Block and heads are the same as the 5.3 (non L33).

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Old 02-13-2009, 12:19 PM
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Lol I am still in the air about my motor being a 4.8 or 5.3 but I am hoping its the 4.8 for no reason other than being different.
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Old 02-13-2009, 01:26 PM
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Try a search--some people have used the 4.8L. Generally they cost about the same as a 5.3, get about the same gas mileage than the 5.3, and make less power than the 5.3... so most people go for the 5.3.
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Old 02-13-2009, 02:52 PM
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Originally Posted by BMR Sales2
Lol I am still in the air about my motor being a 4.8 or 5.3 but I am hoping its the 4.8 for no reason other than being different.
The only way to tell the difference short of a tear down, is to look into the spark plug hole. Flat top piston = 4.8. Dished top = 5.3.

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Old 02-15-2009, 09:04 AM
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l33 5.3 uses 4.8flat top pistons
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Old 02-15-2009, 01:35 PM
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Originally Posted by dogger
l33 5.3 uses 4.8flat top pistons
... and has an aluminum block.

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Old 02-16-2009, 08:38 AM
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Originally Posted by Andy1
The only way to tell the difference short of a tear down, is to look into the spark plug hole. Flat top piston = 4.8. Dished top = 5.3.

Andy1
I was also told there are casting numbers on the crank that will tell. I have to put my GTO oil pan on it this weekend so I will look then.
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