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whats the difference in 5.3 hp rating??

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Old 09-04-2007, 08:50 AM
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Originally Posted by badinfluencelsx
yea... i still havent figured that out for my 4.8 yet either. mine was rated at 255hp 285tq and somehow they are up 40hp 20tq since then. the cam changed but not enough for 40hp.

the 4.8 is 295hp now?
Old 09-04-2007, 08:55 AM
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Originally Posted by shandy294
the 4.8 is 295hp now?
Yeah, in the 07's. I had a 07 4.8 crew cab rental while my F150(3v 5.4) was in the shop- now my truck stock has 300hp and 360tq, but the new 4.8 felt MUCH stronger on the top end than my 5.4. Part of it could be that the 4.8 revved to 6500rpm, while my 5.4 never sees 5000rpm.
Old 09-04-2007, 09:42 AM
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the 4.8 revved to 6500rpm
Are you exaggerating a little bit?

Stock tune shifts at 5600 from 1-2 and 5200 from 2-3

Last edited by Moddoo; 09-04-2007 at 09:50 AM.
Old 09-04-2007, 09:48 AM
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They put high flow cats in the exhaust for 03-04. That was a 10HP gain.
Old 09-04-2007, 10:38 AM
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Originally Posted by Moddoo
Are you exaggerating a little bit?

Stock tune shifts at 5600 from 1-2 and 5200 from 2-3
The tach on this truck was definately going past 6k.
Old 09-04-2007, 11:03 AM
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hey,
I guess I was looking at a 2006 tune.
the 2007 is listed as 295 hp at EDIT:5600rpm.
so they must be shifting a bit higher.
But 6500 would really surprise me.

Now I need to find out. LOL

Last edited by Moddoo; 09-04-2007 at 11:21 AM.
Old 09-04-2007, 11:06 AM
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Originally Posted by Moddoo
hey,
I guess I was looking at a 2006 tune.
the 2007 is listed as 295 hp at 5800rpm.
so they must be shifting a bit higher.
But 6500 would really surprise me.

Now I need to find out. LOL
just go test drive one
The NBS truck motors are still the same blocks right? I know there's the 6.2 out there, but haven't really been able to look into the 07 trucks yet. The 6.2 is just for the escalade this year right?
Old 09-04-2007, 08:50 PM
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mine was 310 hp but mine is the HO
Old 09-04-2007, 08:54 PM
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Originally Posted by trever1t
Heads, Pistons, compression ratio, camshafts, tuning....depending on which 5.3 you refer to.
Say compare a 2000 w/5.3l vs a 2004 w/5.3l?
Old 09-04-2007, 09:18 PM
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Originally Posted by TouchOfEvil04
Say compare a 2000 w/5.3l vs a 2004 w/5.3l?

as far as i know it was only upped 10hp on the rating between those years and from what was said previously in this thread, it was high flow cats


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