Underdrive pulleys on a NNBS silverado

[Mang213]

and I just found out today that the '10 trucks will have vvt on the 4.8s and 5.3s too

[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.

[pl4yboy]

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.

[CHEVROLADE]

my denali doesnt have vvt,,thank g

[GasGuzzler]

There are simply too many weird things on the moderns ones....VVT, DOD, E85....

[Frenchy]

Makes ya wanna use a BFH on them, same reason this is my last late model vehicle

[Mang213]

BFH solves most any problem. Sawzall cleans up the rest

[keniff]

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

[cjriojas]

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

[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.