baggins

iTrader: (15)

so if you had a choice of any factory casting what would you pick? is the 862 the best for a street driven vehicle because it keeps the compression up or would 241's be better?

TonyVette

799 if you want stock compression, 317 if you want lower compression

Coban

iTrader: (14)

If you have a GenIII 5.3:

706/862 if you want stock compression, 243/799 is you want lower compression, 317 if you want the lowest compression


If you have a GenIV 5.3:

Jake99

iTrader: (5)

I wouldnt go lower then 9.5cr, just less power without boost and slower turbo spool. get a 243 and mill then .020 and keep your cr.

quicksilverado

iTrader: (8)

Mill them down and the deck will be thinner. That is asking for trouble, esp when you get used to the boost and decide to turn it up.

slowlsx

iTrader: (26)

Stock, you over think the setup it will run horrible. 317's on a 5.3 is a bad idea. There are alot if guys making 18-23 pounds of boost in the stock heads. Higher compression will make more boost you just need to control detonation by using meth or e85