just picked up a 07 5.3 classic z71 crew yesterday.i wanna do under drive pulleys but cant find any for the 07. is my 5.3 the same as the 06 model? where should i look for these pulleys at?? have found asp's but for the 04

 

pulley's from 99-07 are all the same.....

summit sales them... the only brand that makes them for these trucks is ASP

 

i would spend my money on a more benificial mod such as a tune.

 

i would like to get it tuned as well. how much can a tune do for a stock truck?

 

a soild 20rwhp gain or more, + up to 2-3 mpg. the most worthy mod IMO

 

when i got mine tuned it went from 19.4 mpgs to 19.5.

 

WOW thats awesome dollar per hp!!!! i wanna install cai cat back and the pulleys,then LT headers at some point in time.30+ hp can prob be had with the following??

 

tune is the best bang for your buck as of right now man

 

wouldnt it have to be re tuned after i installed new goodies???

 

Yes you would, but most good tuners offer free re-tunes.