What's the difference between the 99 5.3 and the newer ones?
05-24-2005, 01:01 PM
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What's the difference between the 99 5.3 and the newer ones?
Does anybody know what was changed on the 5.3 to up the hp rating from 99 to newer year models? 1999 was 270hp where 2000 was 285hp. Was it just tuning that was changed? I asked a parts person at a local chevy dealership, and he didn't know. Is it possible that they just underrated the 99?
05-24-2005, 09:54 PM
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Originally Posted by jlwz71
Trust me the 99's were not overated. They used the 6.0 cam in the 5.3 and 4.8 for 2000 along with tuning tweaks. That's it.
05-25-2005, 05:03 AM
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Originally Posted by budhayes3
Plus the injectors like storm5.3 said, except I think the 99's were 21.7 lbs while 02 and up are 24's.
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05-25-2005, 10:25 AM
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Originally Posted by 5.3power
mmy 99 beats an 05 5.3 by one car length and i have 115k miles on it they have like 32k
05-25-2005, 12:27 PM
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I've got a 99 RCSB with a 5.3, and raced a stock 2001 just like mine. I beat him half a truck length. All I had was a FIPK, TB spacer, and a flowmaster.