Underdrive pulleys on a NNBS silverado

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09-28-2009, 02:50 PM
icetraxx08

Underdrive pulleys on a NNBS silverado

I have done a search and read through them but all I have found is members saying that they have them and are going to install and not a followup.

I have a set of underdrive pulleys sitting on my back seat. I am on the fence on taking them back and using the money for either stereo/speaker upgrade or some nerf bars. I have a 08 crew cab with the 5.3ltr. I have a custom tune, dynatech long tube headers & cats, corsa touring cat-back exhaust, and a cai. To those that have installed them in a 07-up nnbs was it worth the install?
Thanks,
Larry
09-29-2009, 10:22 AM
icetraxx08

any one have these on a nnbs?
09-29-2009, 02:37 PM
oleshifty

have one on my 01...same motor. PUT THEM ON
09-29-2009, 10:21 PM
Mang213

Its a simple upgrade for little money and no real side effects. Go for it and let us know your results
10-01-2009, 07:47 PM
11 6.2

Quote:

Originally Posted by Mang213

Its a simple upgrade for little money and no real side effects. Go for it and let us know your results

+1
10-01-2009, 08:51 PM
pl4yboy

Quote:

Originally Posted by oleshifty

have one on my 01...same motor. PUT THEM ON

Not the same motor. His is a Gen4 with VVT.
10-01-2009, 11:32 PM
Mang213

Did all 5.3's have vvt in '08?
10-02-2009, 12:46 AM
cjriojas

i thought only the 6.2 had vvt
10-02-2009, 01:15 AM
pl4yboy

Quote:

Originally Posted by cjriojas

i thought only the 6.2 had vvt

My 5.3 has it.

Quote:

Originally Posted by Mang213

Did all 5.3's have vvt in '08?

I THINK. I'm not positive.
10-02-2009, 07:24 PM
GasGuzzler

You would be surprised how many different engines these things can have....VIN derivitives and RPO's confirm there is more than one of some of the sizes but I'm not sure of all the differences. My dad's GMT900 (NNBS) 2007 Sierra has Flex-Fuel and 4 cylinder mode but no VVT. I too thought the VVT was 6.2 only.
10-02-2009, 08:30 PM
Mang213

and I just found out today that the '10 trucks will have vvt on the 4.8s and 5.3s too
10-02-2009, 11:10 PM
cjriojas

Look what i found
http://media.gm.com/us/powertrain/en...rado_Combo.pdf

I have been searching and cant find anything that says any 5.3 has vvt except for the LC9 which GG mentioned. On other forums ppl say they dont as well.
10-03-2009, 12:58 AM
pl4yboy

Quote:

Originally Posted by GasGuzzler

You would be surprised how many different engines these things can have....VIN derivitives and RPO's confirm there is more than one of some of the sizes but I'm not sure of all the differences. My dad's GMT900 (NNBS) 2007 Sierra has Flex-Fuel and 4 cylinder mode but no VVT. I too thought the VVT was 6.2 only.

Okay, I THOUGHT my 5.3 had it. I'm wrong. Normally, Nathan is right. I did have DOD though. I guess I misread, because I can only find 5.3's with VVT in 2010.
10-03-2009, 10:26 AM
CHEVROLADE

my denali doesnt have vvt,,thank g
10-04-2009, 10:45 AM
GasGuzzler

There are simply too many weird things on the moderns ones....VVT, DOD, E85....
10-04-2009, 11:47 AM
Frenchy

Makes ya wanna use a BFH on them, same reason this is my last late model vehicle
10-04-2009, 12:12 PM
Mang213

BFH solves most any problem. Sawzall cleans up the rest
10-04-2009, 01:37 PM
keniff

never had UD pullies but wonder the true gain of them, considering they cost about 200-250.
10-04-2009, 04:09 PM
cjriojas

Quote:

Originally Posted by keniff

never had UD pullies but wonder the true gain of them, considering they cost about 200-250.

READ!!

http://www.ls1truck.com/forums/racer...e-pulleys.html
10-04-2009, 07:14 PM
oleshifty

200-250 also gets you an intake/exhaust/handheld programmer/etc

none of which yield same results. Overtime they more then pay for themselves in gas mileage savings, and everyone enjoys going a little faster.
10-09-2009, 02:05 AM
timber74wolf

I installed UD pulleys (Moto Blue) on my parent's 04 5.3 Chevy Avalanche (stock with the free mods) and it was a noticeable difference in acceleration. Even my mother of all people noticed the difference. Then they drug their bike trailer to North Carolina from Texas and the gas mileage increased. So a noticeable increase in acceleration and gas mileage. It was never dynoed so we cannot measure the gain, but like I said for my mother to notice a differnce, then there is something to write home about.