David A. Cates

I have a 05 LH6 from a TB EXT. Its a Gen IV, so it has 799's and flat top pistons (9.9:1 CR). I've read through numerous 243/799 topics, but haven't come across anything regarding head milling and CR for a Gen IV 5.3. How much material would I need to have removed to get to 10.5:1? I plan to run a LS2 cam.

I did try out the Wallace Racing calculator, but the numbers didn't seem to add up.

A.R. Shale Targa

iTrader: (2)

roughly .025" would get you to the desired compression ratio you seek
FWIW; The LS2 cam is just horrible in a 5.3.....Hot Rod did an all LS cam/s test in a stock 5.3 and even with aftermarket (Comp 915) valve springs that LS2 stick just became unstable at higher revs.
The 2001-04 LS1/LQ9 cam was the best factory replacement cam for a stock compression 5.3
If you do raise your squeeze up: I'd consider the Cam Motion 210/215
or even the WS6 store new hot cam kit for like $515